vue2

Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example
l
2026-03-26 21:45:32 +08:00 · 2026-03-25 18:13:41 +08:00 · 2026-03-25 18:13:35 +08:00 · 2026-03-24 23:02:59 +08:00 · 2026-03-24 23:02:58 +08:00 · 2026-03-23 16:33:09 +08:00
136 changed files with 4171 additions and 108 deletions
--- a/02-css-layout/11-centering-lab/starter.html
+++ b/02-css-layout/11-centering-lab/starter.html
@@ -6,12 +6,27 @@
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>居中专题</title>
  <style>
    html {
      width: 100%;
      height: 100%;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: rgb(255, 248, 238);
      margin: 0;
      padding: 0;
      width: 100%;
      height: 100%;
      position: fixed;
    }
    .stage {
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      background-color: white;
      border: 1px solid rgba(255, 156, 7, 0.25);
      border-radius: 20px;
@@ -34,7 +49,7 @@
 <body>
  <div class="stage">
-    <div class="box">把我放到中间</div>
+    <div class="box">把我放到中间 transform: translate(-50%, -50%); </div>
  </div>
 </body>
--- a/03-javascript-core/01-variables-and-console/starter.js
+++ b/03-javascript-core/01-variables-and-console/starter.js
@@ -1,6 +1,14 @@
-const userName = "";
+const userName = "小明";
-let currentStage = "";
+let currentStage = "学习中";
 let completedExercises = 0;
 completedExercises = 2;
 console.log('学习者：' + userName);
 console.log('学习阶段：' + currentStage);
 console.log('学习次数：' + completedExercises);
 // 任务：
 // 1. 给上面的变量赋一个合理值
--- a/03-javascript-core/02-data-types-and-conversion/starter.js
+++ b/03-javascript-core/02-data-types-and-conversion/starter.js
@@ -6,3 +6,11 @@ const hasPaid = true;
 // 1. 把 ageText 转成数字，保存到 ageNumber
 // 2. 分别输出 studentName、ageText、ageNumber、hasPaid 的类型
 // 3. 用模板字符串输出一句报名信息
 const ageNumber = Number(ageText);
 console.log(typeof studentName);
 console.log(typeof ageText);
 console.log(typeof ageNumber);
 console.log(typeof hasPaid);
 alert('姓名：${studentName},年龄：{ageNumber},报名状态：{hasPaid}')
--- a/03-javascript-core/03-operators-and-conditions/starter.js
+++ b/03-javascript-core/03-operators-and-conditions/starter.js
@@ -4,6 +4,31 @@ const score = 86;
 // 1. 用布尔值保存是否及格
 // 2. 用 if...else if...else 判断等级
 // 3. 输出分数、是否及格、等级
-
+/*- 根据分数计算是否及格
 - 根据分数输出等级
 - 90 分及以上为 A
 - 80 到 89 为 B
 - 60 到 79 为 C
 - 60 以下为 D*/
 let passed = false;
 let grade = "";
 let point = 70;
 if (point >= 90) {
  grade = 'A'
 } else if (point >= 80 && point <= 89) {
  grade = 'B'
 } else if (point >= 60 && point <= 79) {
  grade = 'C'
 } else if (point <= 60) {
  grade = 'D'
 }
 if (grade != 'D') {
  passed = true
 }
 console.log('分数：${point}');
 console.log('是否及格：${passed}');
 console.log('等级：${grade}');
--- a/03-javascript-core/04-loops/starter.js
+++ b/03-javascript-core/04-loops/starter.js
@@ -5,3 +5,17 @@
 // 4. 输出 sum
 let sum = 0;
 for (let i = 1; i <= 7; i++) {
  console.log(i);
  if (i == 4) {
    continue
  }
 }
 let j = 1
 while (j <= 5) {
  sum = sum + j
  j++
 }
 console.log(sum);
--- a/03-javascript-core/05-functions/starter.js
+++ b/03-javascript-core/05-functions/starter.js
@@ -1,11 +1,30 @@
 function getAverage(score1, score2, score3) {
  return (score1 + score2 + score3) / 3
  // 返回平均分
 }
 function getLevel(average) {
  if (average >= 90) {
    return '优秀'
  } else if (average >= 60 && average < 90) {
    return '良好'
  } else {
    return '继续努力'
  }
  // 根据平均分返回等级描述
 }
 const average = getAverage(75, 89, 100)
 const level = getLevel(average)
 console.log(average);
 console.log(level);
 // 任务：
 // 1. 调用上面两个函数
 // 2. 输出平均分和等级
 /*- 写一个 `getAverage` 函数
 - 接收 3 个分数参数
 - 返回平均分
 - 再写一个 `getLevel` 函数
 - 根据平均分返回“优秀”“良好”“继续努力”*/
--- a/03-javascript-core/06-arrays/starter.js
+++ b/03-javascript-core/06-arrays/starter.js
@@ -4,3 +4,13 @@ const topics = ["HTML", "CSS", "JavaScript"];
 // 1. 往 topics 里新增一个主题
 // 2. 输出 topics 的长度
 // 3. 用循环输出每一项
 /*- 创建一个包含 3 个学习主题的数组
 - 新增 1 个学习主题
 - 输出数组长度
 - 依次输出每个学习主题*/
 topics.push('Vue')
 console.log(topics.length);
 for (let i = 0; i < topics.length; i++) {
  console.log(topics[i]);
 }
--- a/03-javascript-core/07-objects/starter.js
+++ b/03-javascript-core/07-objects/starter.js
@@ -9,3 +9,15 @@ const course = {
 // 2. 新增 teacher 属性
 // 3. 输出完整对象
 // 4. 输出 title 和 teacher
 /*- 创建一个课程对象
 - 至少包含名称、课时、是否完结
 - 修改其中一个属性
 - 新增一个老师属性
 - 输出完整对象和其中两个单独属性*/
 course.finished = true
 course.teacher = '李老师'
 console.log(course);
 console.log(course.title);
 console.log(course.lessons);
--- a/03-javascript-core/08-built-in-methods/starter.js
+++ b/03-javascript-core/08-built-in-methods/starter.js
@@ -6,3 +6,11 @@ const tags = ["变量", "条件", "函数"];
 // 2. 转成大写
 // 3. 判断是否包含 JS
 // 4. 把 tags 用顿号连接成一句话
 /*- 把一段带空格的文本去掉首尾空格
 - 把结果转成大写
 - 判断里面是否包含 `JS`
 - 把一个标签数组拼成一个字符串输出*/
 const rawTrim = rawTitle.trim()
 const rawTo = rawTitle.toUpperCase()
 const result = rawTitle.includes("JS")
 const tagsJoin = rawTitle.join(",")
--- a/03-javascript-core/09-scope-and-closure/starter.js
+++ b/03-javascript-core/09-scope-and-closure/starter.js
@@ -2,10 +2,27 @@ function createCounter() {
  let count = 0;
  // 返回一个函数
  function a() {
    count++
    return count
  }
 }
 const counterA = createCounter()
 const counterB = createCounter()
 console.log(counterA());
 console.log(counterA());
 console.log(counterB());
 // 任务：
 // 1. 创建 counterA 和 counterB
 // 2. 连续调用 counterA 两次
 // 3. 再调用 counterB 一次
 // 4. 观察为什么两个计数器互不影响
 /*写一个 `createCounter` 函数
 - 在函数内部定义 `count`
 - 返回一个内部函数
 - 每次调用内部函数时，`count` 都加 1
 - 创建两个不同的计数器
 - 观察为什么它们各自记住了自己的 `count`*/
--- a/03-javascript-core/10-final-mini-app/starter.js
+++ b/03-javascript-core/10-final-mini-app/starter.js
@@ -7,14 +7,35 @@ const scores = [78, 85, 92];
 function getAverageScore(list) {
  // 计算平均分
  let sum = 0
  for (let i = 0; i < list.length; i++) {
    sum = sum + list[i]
  }
  return sum / list.length
 }
 function getLevel(average) {
  // 返回等级
  if (average >= 80) {
    return "可以进入下一阶段"
  } else {
    return "保持当前等级"
  }
 }
 const average = getAverageScore(scores)
 const level = getLevel(average)
 console.log("姓名：" + student.name + "阶段：" + student.stage + "平均分：" + "average" + "等级：" + level);
 // 任务：
 // 1. 计算平均分
 // 2. 计算等级
 // 3. 输出姓名、阶段、平均分、等级
 // 4. 如果平均分 >= 80，输出“可以进入下一阶段”
 /*一个 `student` 对象
 - 一个 `scores` 数组
 - 一个计算平均分的函数
 - 一个判断等级的函数
 - 输出姓名、平均分、等级
 - 如果平均分大于等于 80，再输出“可以进入下一阶段”*/
--- a/03-javascript-core/11-var-and-scope/starter.js
+++ b/03-javascript-core/11-var-and-scope/starter.js
@@ -13,15 +13,24 @@ function compareScope() {
    console.log("块内：", lessonName, chapterName, stage);
  }
-
+  var lessonName = "变量";
  let chapterName = "作用域";
  const stage = "进阶";
  console.log("块内：", lessonName);
  // 任务：
  // 1. 输出 lessonName
  // 2. 不要直接在这里输出 chapterName，否则会报错
  // 3. 用一句注释说明为什么
 }
 compareScope();
 // 任务：
 // 4. 试着重新给 const 声明的值赋值
 // 5. 观察会发生什么
 /*观察 `var` 声明前为什么能访问到 `undefined`
 - 用 `var` 声明一个函数内部变量
 - 用 `let` 声明一个代码块内部变量
 - 在可访问的位置输出它们
 - 观察为什么 `var` 在块外还能访问，而 `let` 不行
 - 再写一段代码证明 `const` 不能被重新赋值*/
--- a/03-javascript-core/12-this-keyword/README.md
+++ b/03-javascript-core/12-this-keyword/README.md
@@ -25,3 +25,11 @@
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/03-javascript-core/12-this-keyword/starter.js)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/03-javascript-core/12-this-keyword/answer.js)
 function a() {
 }
 const b = () => {
 }
--- a/03-javascript-core/12-this-keyword/starter.js
+++ b/03-javascript-core/12-this-keyword/starter.js
@@ -4,15 +4,25 @@ const student = {
  sayHello() {
    // 任务：
    // 1. 用 this.name 输出问候语
    console.log(this.name + "你好！");
  },
  createArrowReporter() {
    // 任务：
    // 2. 返回一个箭头函数
    // 3. 在箭头函数里输出 this.name
    return () => {
      console.log(this.name);
    }
  },
 };
 // 任务：
 // 4. 调用 student.sayHello()
 student.sayHello()
 // 5. 把 student.sayHello 赋值给 detachedHello 再调用
 const detachedHello = student.sayHello
 detachedHello()
 // 6. 调用 createArrowReporter 返回的新函数
 student.createArrowReporter()()
--- a/03-javascript-core/13-array-high-order-methods/starter.js
+++ b/03-javascript-core/13-array-high-order-methods/starter.js
@@ -5,6 +5,20 @@ const students = [
  { name: "小陈", finished: false },
 ];
 const scores1 = scores.map(item => item = item + '分')
 const scores2 = scores.filter(item => item > 60)
 const scores3 = scores.reduce((acc, item) => { return item + acc }, 0)
 const scores4 = scores.find(item => item >= 90)
 const scores5 = scores.some(item => item >= 90)
 const scores6 = students.every(item => item.finished === true)
 console.log("分数：" + scores1);
 console.log("及格分：" + scores2);
 console.log("总分：" + scores3);
 console.log("第一个 >= 90 的分数：" + scores4);
 console.log("是否存在不及格：" + scores5);
 console.log("是否都及格：" + scores6);
 // 任务：
 // 1. 用 map 生成 ["58分", ...]
 // 2. 用 filter 筛出及格分
@@ -12,3 +26,9 @@ const students = [
 // 4. 用 find 找到第一个 >= 90 的分数
 // 5. 用 some 判断是否存在不及格
 // 6. 用 every 判断 students 是否都 finished 为 true
 /* 用 `map` 生成带单位的新数组
 - 用 `filter` 找出及格成绩
 - 用 `reduce` 计算总分
 - 用 `find` 找出第一条大于等于 90 的成绩
 - 用 `some` 判断是否有人不及格
 - 用 `every` 判断是否全部完成考试*/
--- a/03-javascript-core/14-memory-and-execution/starter.js
+++ b/03-javascript-core/14-memory-and-execution/starter.js
@@ -19,7 +19,16 @@ function printStepTwo() {
 function updateUser(user) {
  // 任务：
  // 1. 修改 user.city
  user.city = '北京'
 }
 scoreB = 90
 console.log('scoreA' + scoreA + ',scoreB' + scoreB);
 userB.city = '秦皇岛'
 console.log(userA.city, userB.city);
 printStepOne()
 printStepTwo()
 updateUser(userA)
 console.log(userA);
 // 任务：
 // 2. 修改 scoreB，观察 scoreA 是否变化
--- a/03-javascript-core/15-switch-break-and-empty-values/starter.js
+++ b/03-javascript-core/15-switch-break-and-empty-values/starter.js
@@ -6,9 +6,43 @@ const finalComment = null;
 let statusText = "";
 const finishedRecords = [];
 switch (learningStatus) {
  case 'review':
    console.log('已学习')
    break
  case 'ing':
    console.log('学习中');
    break
  case 'prepare':
    console.log('未学习');
    break
  default:
    console.log('状态未知');
    break
 }
 console.log(optionalNote, finalComment);
 for (let i = 0; i < records.length; i++) {
  if (records[i] === null || records[i] === undefined) {
    console.log(`第${i + 1}项为空值，停止读取`)
    break
  } else {
    finishedRecords.push(records[i])
  }
 }
 console.log(finishedRecords)
 // 任务：
 // 1. 用 switch 给 learningStatus 生成说明文字
 // 2. 输出 optionalNote 和 finalComment 分别是什么
 // 3. 用 for 循环读取 records
 // 4. 如果遇到 undefined 或 null，就 break
 // 5. 输出 finishedRecords
 /*用 `switch` 根据学习状态输出不同说明
 - 观察 `undefined` 和 `null` 的区别
 - 用循环读取学习记录
 - 如果读到 `undefined` 或 `null`，立即用 `break` 停止循环
 - 输出停止前已经读取到的内容*/
--- a/03-javascript-core/16-final-review/starter.js
+++ b/03-javascript-core/16-final-review/starter.js
@@ -2,6 +2,7 @@ const reviewer = {
  name: "林晨",
  stage: "final-review",
  showTitle() {
    console.log(`学习营总复盘器`);
    // 输出总复盘标题
  },
 };
@@ -14,12 +15,47 @@ const lessons = [
  { title: "综合回顾", score: 95, finished: true },
 ];
-let mentorNote;
+let mentorNote;//undefined
-const reviewComment = null;
+const reviewComment = null;//null
 function getStageText(stage) {
  // 用 switch 返回阶段说明
  switch (stage) {
    case 'final-review':
      console.log('已学习');
      break
    case 'ing-review':
      console.log('学习中');
      break
    case 'start-review':
      console.log('未学习');
      break
    default:
      console.log('状态未知');
      break
  }
 }
 reviewer.showTitle()
 console.log(mentorNote, reviewComment);
 const lessons1 = []
 for (let i = 0; i < lessons.length; i++) {
  if (lessons[i].score != null) {
    lessons1.push(lessons[i])
  }
 }
 const sum = lessons.reduce((acc, item) => {
  return acc + item.score
 }, 0)
 console.log("总分：" + sum);
 console.log(`平均分：${sum / lessons.length}`);
 const reviewerAlias = reviewer
 reviewerAlias.stage = 'ing-review'
 console.log(reviewer.stage, reviewerAlias.stage);
 // 任务：
 // 1. 调用 reviewer.showTitle()
@@ -28,3 +64,11 @@ function getStageText(stage) {
 // 4. 用高阶函数统计课程标题、完成状态和平均分
 // 5. 创建 reviewerAlias 指向 reviewer，修改 stage，观察原对象是否变化
 // 6. 输出最终结果
 /* 一个带方法的 `reviewer` 对象
 - 一个 `lessons` 数组
 - 一个用 `switch` 输出阶段说明的函数
 - 一个用 `for + break` 清洗有效数据的过程
 - 至少两个数组高阶函数
 - 对 `undefined` 和 `null` 的判断
 - 一段对象引用变化的观察代码
 - 最终输出标题、有效课程、平均分、完成状态*/
--- a/04-dom-events-async/01-query-selectors/starter.html
+++ b/04-dom-events-async/01-query-selectors/starter.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
-  <head>
+
 <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>获取元素</title>
@@ -34,10 +35,13 @@
      border: 1px solid #dce8f8;
    }
  </style>
-  </head>
+</head>
-  <body>
+
 <body>
  <section class="panel">
-      <h1 id="page-title">DOM 获取元素练习</h1>
+    <h1 id="page-title">
      <p>111</p> 获取元素练习
    </h1>
    <button class="start-btn" type="button">开始学习</button>
    <div class="cards">
@@ -48,5 +52,8 @@
  </section>
  <script src="./starter.js"></script>
-  </body>
+
 </body>
 </html>
--- a/04-dom-events-async/01-query-selectors/starter.js
+++ b/04-dom-events-async/01-query-selectors/starter.js
@@ -3,3 +3,11 @@
 // 2. 用 querySelector 获取按钮
 // 3. 用 querySelectorAll 获取全部卡片
 // 4. 在控制台输出标题文字、按钮文字和卡片数量
 const a = document.getElementById("page-title")
 console.log(a.textContent);
 const b = document.querySelector(".start-btn")
 console.log(b.textContent);
 const c = document.querySelectorAll(".card")
 console.log(c.length);
--- a/04-dom-events-async/02-text-class-style/starter.js
+++ b/04-dom-events-async/02-text-class-style/starter.js
@@ -3,3 +3,9 @@
 // 2. 修改标题文字
 // 3. 给标签加上 done 类名
 // 4. 修改描述文字颜色
 const a = document.getElementById("title")
 const b = document.getElementById("description")
 const c = document.getElementById("badge")
 a.textContent = "学习状态非常好"
 a.classList.add("badge.done")
 b.style.color = "red"
--- a/04-dom-events-async/03-create-and-remove/starter.js
+++ b/04-dom-events-async/03-create-and-remove/starter.js
@@ -1,4 +1,22 @@
 // 任务：
 // 1. 获取新增按钮、删除按钮和列表
 // 2. 点击新增按钮时创建一个新的 li 并追加到列表
 // 3. 点击删除按钮时删除最后一个 li
 const add = document.getElementById("add-btn")
 const remove = document.getElementById("remove-btn")
 const list = document.getElementById("task-list")
 add.onclick = function () {
  const a = document.createElement("li")
  a.textContent = "巧克力"
  list.appendChild(a)
 }
 remove.onclick = function () {
  const c = list.lastElementChild
  if (c) {
    c.remove()
  }
 }
--- a/04-dom-events-async/04-click-counter/starter.js
+++ b/04-dom-events-async/04-click-counter/starter.js
@@ -4,3 +4,26 @@ let count = 0;
 // 1. 获取数字元素和 3 个按钮
 // 2. 点击按钮时更新 count
 // 3. 每次修改后，把最新 count 渲染到页面
 const num = document.getElementById("value")
 const del = document.getElementById("decrease-btn")
 const add = document.getElementById("increase-btn")
 const reset = document.getElementById("reset-btn")
 function ren() {
  num.textContent = count
 }
 add.addEventListener("click", function () {
  count++
  ren()
 })
 del.addEventListener("click", function () {
  count--
  ren()
 })
 reset.addEventListener("click", function () {
  count = 0
  ren()
 })
--- a/04-dom-events-async/05-form-submit-and-prevent-default/starter.js
+++ b/04-dom-events-async/05-form-submit-and-prevent-default/starter.js
@@ -4,3 +4,17 @@
 // 3. 用 preventDefault() 阻止默认提交
 // 4. 读取输入框内容，创建新 li，追加到列表
 // 5. 清空输入框
 const form = document.getElementById("todo-form")
 const input = document.getElementById("todo-input")
 const list = document.getElementById("todo-list")
 form.addEventListener("submit", function (e) {
  e.preventDefault()
  const text = input.value.trim()
  if (text) {
    const li = document.createElement("li")
    li.textContent = text
    list.appendChild(li)
    input.value = ""
  }
 })
--- a/04-dom-events-async/06-bubbling-and-delegation/starter.js
+++ b/04-dom-events-async/06-bubbling-and-delegation/starter.js
@@ -3,3 +3,28 @@
 // 2. 给 lesson-list 绑定点击事件，使用事件委托
 // 3. 点击 li 时切换 active 类名
 // 4. 点击删除按钮时，阻止冒泡并删除当前 li
 const panel = document.getElementById("panel")
 panel.addEventListener("click", function () {
  console.log("点击外部")
 })
 const list = document.getElementById("lesson-list")
 list.addEventListener("click", function (event) {
  const remove = event.target.closest(".remove-btn")
  if (remove) {
    const li = remove.closest(".lesson-item")
    if (li) {
      li.remove()
      event.stopPropagation()
    }
    return
  }
  const tog = event.target.closest(".lesson-item")
  if (tog) {
    tog.classList.add("active")
  }
 })
--- a/04-dom-events-async/07-timers-and-async-order/starter.js
+++ b/04-dom-events-async/07-timers-and-async-order/starter.js
@@ -3,4 +3,24 @@
 // 2. 点击按钮后清空旧日志
 // 3. 先追加“开始执行”
 // 4. 用 setTimeout 延迟追加“异步回调完成”
 // 5. 再立刻追加“同步代码结束”
 const btn = document.getElementById("run-btn")
 const list = document.getElementById("log-list")
 function add1(message) {
  const li = document.createElement("li")
  li.textContent = message
  list.appendChild(li)
 }
 btn.addEventListener("click", function () {
  list.textContent = ""
  add1("开始执行")
  setTimeout(function () {
    add1("异步回调完成")
  }, 2000)
  add1("同步代码结束")
 })
--- a/04-dom-events-async/08-promise-and-render/starter.js
+++ b/04-dom-events-async/08-promise-and-render/starter.js
@@ -12,3 +12,23 @@ function fakeFetchCourses() {
 // 3. 调用 fakeFetchCourses()
 // 4. 用 then 渲染课程列表
 // 5. 用 catch 处理错误
 const btn = document.getElementById("load-btn")
 const text = document.getElementById("status-text")
 const list = document.getElementById("course-list")
 btn.addEventListener("click", function () {
  text.textContent = "加载中..."
  fakeFetchCourses()
    .then(function (result) {
      text.textContent = "加载成功"
      const a = result.forEach(item => {
        const li = document.createElement("li")
        li.textContent = item
        list.appendChild(li)
      });
    })
    .catch(function (error) {
      list.textContent = "失败" + error
    })
 })
--- a/04-dom-events-async/09-async-await-panel/starter.js
+++ b/04-dom-events-async/09-async-await-panel/starter.js
@@ -16,3 +16,24 @@ function fakeFetchUser() {
 // 3. 用 await 等待 fakeFetchUser()
 // 4. 渲染用户信息
 // 5. 用 try...catch 处理异常
 const btn = document.getElementById("load-user-btn")
 const status = document.getElementById("user-status")
 const card = document.getElementById("user-card")
 async function a() {
  status.textContent = "加载中"
  card.innerHTML = ""
  try {
    const a = await fakeFetchUser()
    status.textContent = "加载成功"
    card.innerHTML = `
    <p>姓名：${a.name}</p>
    <p>角色：${a.role}</p>
    <p>任务：${a.focus}</p>
    `
  } catch (error) {
    status.textContent = "加载失败"
  }
 }
 btn.addEventListener("click", a)
--- a/04-dom-events-async/10-final-dashboard/starter.js
+++ b/04-dom-events-async/10-final-dashboard/starter.js
@@ -20,3 +20,85 @@ function fakeLoadExtraLessons() {
 // 3. 点击列表项时切换 done 状态
 // 4. 提交表单时阻止默认提交，并新增课程
 // 5. 点击加载按钮时显示加载状态，并把异步返回的课程追加到列表
 /* 一个课程列表区域
 - 一个表单区域
 - 一个添加课程的交互
 - 一个点击课程切换完成状态的交互
 - 一个异步加载提示或远程数据模拟
 - 清晰的状态文案更新*/
 const page = document.querySelector(".page")
 const hero = document.querySelector("hero")
 const text = document.getElementById("status-text")
 const panel = document.querySelector(".panel")
 const btn = document.getElementById("load-btn")
 const list = document.getElementById("lesson-list")
 const formPanel = document.querySelector(".form-panel")
 const lessonForm = document.getElementById("lesson-form")
 const lessonInput = document.getElementById("lesson-input")
 function renderLessons() {
  lessons.forEach(item => {
    const li = document.createElement("li")
    li.classList.add("li")
    li.setAttribute("title", item.title)
    li.setAttribute("done", item.done)
    li.textContent = `
    标题：${item.title}
    状态：${item.done}`
    list.appendChild(li)
  })
 }
 renderLessons()
 //event.target,closest,
 list.addEventListener("click", function (event) {
  const a = event.target.closest(".li")
  if (a) {
    a.textContent = `
    标题：${a.title}
    状态：${!a.done}`
    a.done = !a.done
  }
 })
 lessonForm.addEventListener("submit", function (event) {
  event.preventDefault()
  const c = document.createElement("li")
  const d = lessonInput.value.trim()
  c.textContent = `
  标题：${d}
  状态：true`
  c.setAttribute("title", d)
  c.setAttribute("done", true)
  c.classList.add("li")
  lessonInput.value = ""
  list.appendChild(c)
 })
 async function load() {
  text.textContent = "加载中"
  text.innerHTML = ""
  try {
    const s = await fakeLoadExtraLessons()
    text.textContent = "加载完成"
    s.forEach(item => {
      const li = document.createElement("li")
      li.classList.add("li")
      li.setAttribute("title", item.title)
      li.setAttribute("done", item.done)
      li.textContent = `
    标题：${item.title}
    状态：${item.done}`
      list.appendChild(li)
    })
  } catch (error) {
    text.textContent = "加载失败"
  }
 }
 btn.addEventListener("click", load)
--- a/04-dom-events-async/11-input-live-preview/starter.js
+++ b/04-dom-events-async/11-input-live-preview/starter.js
@@ -4,3 +4,26 @@
 // 3. 把输入内容实时渲染到右侧预览
 // 4. 监听阶段下拉框的 change 事件
 // 5. 更新阶段标签文字
 const nickname = document.getElementById("nickname-input")
 const goal = document.getElementById("goal-input")
 const stage = document.getElementById("stage-select")
 nickname.addEventListener("input", function () {
  const previewName = document.getElementById("preview-name")
  previewName.textContent = nickname.value
  if (!nickname.value.trim()) {
    previewName.textContent = "未填写昵称"
  }
 })
 goal.addEventListener("input", function () {
  const previewGoal = document.getElementById("preview-goal")
  previewGoal.textContent = goal.value
  if (!goal.value.trim()) {
    previewGoal.textContent = "这里会显示你的学习目标。"
  }
 })
 stage.addEventListener("change", function () {
  const previewStage = document.getElementById("preview-stage")
  previewStage.textContent = stage.value
 })
--- a/04-dom-events-async/12-prepend-remove-and-link-default/starter.js
+++ b/04-dom-events-async/12-prepend-remove-and-link-default/starter.js
@@ -4,3 +4,26 @@
 // 3. 点击 clear-active-btn 时移除所有 item 的 active 类名
 // 4. 点击帮助链接时，用 preventDefault() 阻止跳转
 // 5. 在提示文字里输出“已阻止默认跳转”
 const prependBtn = document.getElementById("prepend-btn")
 const clear = document.getElementById("clear-active-btn")
 const helpLink = document.getElementById("help-link")
 const hintText = document.getElementById("hint-text")
 const messageList = document.getElementById("message-list")
 prependBtn.addEventListener("click", function () {
  const li = document.createElement("li")
  li.classList.add("item")
  messageList.prepend(li)
 })
 clear.addEventListener("click", function () {
  const a = document.querySelectorAll("#message-list li")
  a.forEach(item => {
    item.classList.remove("active")
  })
 })
 helpLink.addEventListener("click", function (event) {
  event.preventDefault()
  hintText.textContent = "已阻止默认跳转"
 })
--- a/05-es6-plus/01-template-and-destructuring/starter.js
+++ b/05-es6-plus/01-template-and-destructuring/starter.js
@@ -9,3 +9,10 @@ const scores = [88, 92, 95];
 // 1. 解构出 name、stage
 // 2. 解构出前两个分数
 // 3. 用模板字符串把信息写入 #output
 const { name, stage } = student
 const [a, b] = scores
 const output = document.getElementById("output")
 output.innerHTML = `
 a = ${a}
 b = ${b}
 `
--- a/05-es6-plus/02-spread-and-rest/starter.js
+++ b/05-es6-plus/02-spread-and-rest/starter.js
@@ -7,6 +7,14 @@ const user = {
 function sumScores(...scores) {
  // 返回总分
  /*let total = 0
  scores.forEach(item => {
    total = total+item
  })
  return total*/
  return scores.reduce((acc, item) => {
    return acc + item
  }, 0)
 }
 // 任务：
@@ -14,3 +22,11 @@ function sumScores(...scores) {
 // 2. 基于 user 生成一个 stage 为 "现代 JS" 的新对象
 // 3. 调用 sumScores
 // 4. 输出结果到 #output
 const tracks1 = [...tracks, "ES6+"]
 const user1 = {
  ...user,
  stage: "现代 JS"
 }
 const sum = sumScores(1, 2, 3, 4)
 const output = document.getElementById("output")
 output.textContent = sum
--- a/05-es6-plus/03-arrow-functions/starter.js
+++ b/05-es6-plus/03-arrow-functions/starter.js
@@ -12,3 +12,7 @@ const tracks = ["DOM", "异步", "模块化"];
 // 1. 把 getLevel 改成箭头函数
 // 2. 把 add 改成箭头函数
 // 3. 用 map + 箭头函数生成 ["[DOM]", ...]
 const getLevel1 = score => score >= 80
 const add1 = (a, b) => a + b
 const tracks1 = tracks.map(item => `[${item}]`)
 console.log(tracks1);
--- a/05-es6-plus/04-modules-basic/README.md
+++ b/05-es6-plus/04-modules-basic/README.md
@@ -1,4 +1,5 @@
-# 练习 4：模块基础
+# 
 练习 4：模块基础
 ## 目标
@@ -9,7 +10,6 @@
 - `export`
 - `import`
 - `type="module"`
 ## 任务
 - 从模块文件里导入课程数据和格式化函数
--- a/05-es6-plus/04-modules-basic/starter.js
+++ b/05-es6-plus/04-modules-basic/starter.js
@@ -1,3 +1,7 @@
 // 任务：
 // 1. 从 ./course-data.js 导入 courses 和 formatCourse
 // 2. 把格式化后的结果写入 #output
 import { courses, formatCourse } from "./course-data.js"
 const a = courses.map(item => formatCourse(item))
 const output = document.getElementById("output")
 output.textContent = a
--- a/05-es6-plus/05-promise-basics/starter.js
+++ b/05-es6-plus/05-promise-basics/starter.js
@@ -10,3 +10,17 @@ function loadTracks() {
 // 1. 调用 loadTracks()
 // 2. 成功时更新状态和输出内容
 // 3. 失败时更新状态
 async function load() {
  const status = document.getElementById("status")
  status.textContent = "加载中"
  try {
    const a = await loadTracks()
    status.textContent = "加载成功"
    const output = document.getElementById("output")
    output.textContent = a
  } catch (error) {
    status.textContent = "加载失败"
  }
 }
 load()
--- a/05-es6-plus/06-async-await/starter.js
+++ b/05-es6-plus/06-async-await/starter.js
@@ -13,3 +13,16 @@ function loadConfig() {
 // 1. 写一个 async 函数
 // 2. 用 await 等待 loadConfig()
 // 3. 用 try...catch 处理流程
 async function load() {
  const status = document.getElementById("status")
  status.textContent = "加载中"
  try {
    const a = await loadConfig()
    status.textContent = "加载成功"
    const output = document.getElementById("output")
    output.textContent = JSON.stringify(a)
  } catch (error) {
    status.textContent = "加载失败"
  }
 }
 load()
--- a/05-es6-plus/07-arrow-this/starter.js
+++ b/05-es6-plus/07-arrow-this/starter.js
@@ -1,6 +1,11 @@
 const trainer = {
  name: "现代 JS 训练营",
  report() {
    setTimeout(() => {
      const a = this.name
      const output = document.getElementById("output")
      output.textContent = a
    }, 1000)
    // 任务：
    // 1. 用 setTimeout
    // 2. 在回调里用箭头函数读取 this.name
--- a/05-es6-plus/08-fetch-and-json/starter.js
+++ b/05-es6-plus/08-fetch-and-json/starter.js
@@ -1,5 +1,5 @@
 const loadButton = document.getElementById("load-btn");
-const status = document.getElementById("status");
+const status1 = document.getElementById("status");
 const output = document.getElementById("output");
 // 任务：
@@ -9,3 +9,17 @@ const output = document.getElementById("output");
 // 4. 调用 res.json() 解析数据
 // 5. 把 title 和 body 渲染到页面
 // 6. 失败时显示“加载失败”
 loadButton.addEventListener("click", async () => {
  status1.textContent = "加载中..."
  try {
    let a = await fetch("https://jsonplaceholder.typicode.com/posts/1")
    let data = await a.json()
    status1.textContent = "加载成功"
    const { title, body } = data
    output.textContent = `title:${title}
    body:${body}`
  } catch (error) {
    status1.textContent = "加载失败"
  }
 })
--- a/05-es6-plus/09-final-modern-js/starter.js
+++ b/05-es6-plus/09-final-modern-js/starter.js
@@ -5,3 +5,28 @@
 // 4. 用展开运算符合并技能
 // 5. 用模板字符串渲染标题和说明
 // 6. 用 forEach 或 map + 箭头函数渲染列表
 import { baseSummary, loadExtraSkills } from './summary-service.js'
 async function get() {
  const title = document.getElementById("title")
  const intro = document.getElementById("intro")
  title.textContent = '加载中...'
  intro.innerHTML = ''
  try {
    let load = await loadExtraSkills()
    title.textContent = '加载成功'
    const { name, stage, skills } = baseSummary
    intro.textContent = `
      name:${name}
      stage:${stage}`
    load = [...load, ...skills]
    load.forEach(item => {
      const li = document.createElement("li")
      const skillList = document.getElementById("skill-list")
      li.textContent = item
      skillList.appendChild(li)
    });
  } catch (error) {
    title.textContent = '加载失败'
  }
 }
 get()
--- a/06-typescript/02-basic-type-annotations/starter.ts
+++ b/06-typescript/02-basic-type-annotations/starter.ts
@@ -1,7 +1,10 @@
-let age: number = 18;
+let age: number = 88;
 let userName: string = "Tom";
 let isPaid: boolean = true;
 // 任务：
 // 1. 修改上面的值，让它们更像一个学习者资料
 // 2. 输出一句完整信息
 console.log(`姓名：${userName}
 年龄：${age}
 状态：${isPaid}`);
--- a/06-typescript/03-array-and-function-types/starter.ts
+++ b/06-typescript/03-array-and-function-types/starter.ts
@@ -2,9 +2,12 @@ const scoreList: number[] = [82, 90, 95];
 function sum(a: number, b: number): number {
  // 返回两个数字之和
-  return 0;
+  return a + b;
 }
 console.log(scoreList, sum(2, 3));
 // 任务：
 // 1. 改写 sum 的返回值
 // 2. 调用 sum
--- a/06-typescript/04-interface-object-shape/starter.ts
+++ b/06-typescript/04-interface-object-shape/starter.ts
@@ -13,3 +13,4 @@ const user: User = {
 // 任务：
 // 1. 把对象内容改成学习者资料
 // 2. 输出 name 和 age
 console.log(user.name, user.age);
--- a/06-typescript/05-generic-functions/starter.ts
+++ b/06-typescript/05-generic-functions/starter.ts
@@ -2,6 +2,9 @@ function getData<T>(data: T): T {
  // 返回 data
  return data;
 }
 const n = getData<number>(100)
 const s = getData("123")
 console.log(n, s);
 // 任务：
 // 1. 用 number 调用
--- a/06-typescript/06-union-and-optional-props/starter.ts
+++ b/06-typescript/06-union-and-optional-props/starter.ts
@@ -4,6 +4,15 @@ interface User {
  name: string;
  age?: number;
 }
 id = "hello"
 const userA: User = {
  name: "小李",
  age: 18
 }
 const userB: User = {
  name: "小柔"
 }
 console.log(userA, userB);
 // 任务：
 // 1. 把 id 改成字符串也试一次
--- a/06-typescript/07-type-safe-renderer/starter.ts
+++ b/06-typescript/07-type-safe-renderer/starter.ts
@@ -11,8 +11,12 @@ const courses: Course[] = [
 function renderCourseLines(list: Course[]): string[] {
  // 返回渲染后的字符串数组
-  return [];
+  const a = list.map(item => {
    return item.title
  })
  return a;
 }
 console.log(renderCourseLines(courses));
 // 任务：
 // 1. 实现 renderCourseLines
--- a/06-typescript/08-final-mini-app/starter.ts
+++ b/06-typescript/08-final-mini-app/starter.ts
@@ -18,7 +18,9 @@ function pickFirst<T>(list: T[]): T {
 function formatStudent(student: Student): string {
  // 返回一段摘要文字
-  return "";
+  return `学号：${student.id}
  姓名：${student.name}
  年龄：${student.age?.toFixed()}`;
 }
 const student: Student = {
@@ -30,6 +32,8 @@ const student: Student = {
  ],
 };
 console.log(formatStudent(student), pickFirst(student.courses));
 // 任务：
 // 1. 实现 formatStudent
 // 2. 用 pickFirst 取第一门课程
--- a/06-typescript/src/main.ts
+++ b/06-typescript/src/main.ts
@@ -1,10 +1,7 @@
 import "./style.css";
 import { lessons } from "./lessons";
-function getRequiredElement<T extends Element>(
+function getRequiredElement<T extends Element>(selector: string, parent: ParentNode = document): T {
  selector: string,
  parent: ParentNode = document,
 ): T {
  const element = parent.querySelector<T>(selector);
  if (!element) {
@@ -35,34 +32,21 @@ app.innerHTML = `
        <p id="lesson-focus" class="focus"></p>
        <p id="lesson-summary" class="summary"></p>
      </section>
-      <section class="grid">
+      <section >
        <article class="card">
          <div class="card-head">
            <h3>知识点</h3>
          </div>
          <ul id="lesson-points" class="point-list"></ul>
        </article>
        <article class="card">
          <div class="card-head">
            <h3>运行结果</h3>
            <button id="run-demo" class="run-button" type="button">运行演示</button>
          </div>
          <div id="lesson-output" class="output-panel"></div>
        </article>
      </section>
-      <section class="grid code-grid">
+      <section >
        <article class="card code-card">
          <div class="card-head">
            <h3>Starter</h3>
          </div>
          <pre><code id="starter-code"></code></pre>
        </article>
        <article class="card code-card">
          <div class="card-head">
            <h3>Answer</h3>
          </div>
          <pre><code id="answer-code"></code></pre>
        </article>
      </section>
    </main>
  </div>
@@ -73,10 +57,7 @@ const title = getRequiredElement<HTMLElement>("#lesson-title");
 const focus = getRequiredElement<HTMLElement>("#lesson-focus");
 const summary = getRequiredElement<HTMLElement>("#lesson-summary");
 const pointList = getRequiredElement<HTMLElement>("#lesson-points");
 const output = getRequiredElement<HTMLElement>("#lesson-output");
 const starterCode = getRequiredElement<HTMLElement>("#starter-code");
 const answerCode = getRequiredElement<HTMLElement>("#answer-code");
 const runButton = getRequiredElement<HTMLButtonElement>("#run-demo");
 let activeLessonId = lessons[0]?.id ?? "";
@@ -101,12 +82,6 @@ function renderLessonList(): void {
    .join("");
 }
 function renderOutput(lines: string[]): void {
  output.innerHTML = lines
    .map((line) => `<div class="output-line">${line}</div>`)
    .join("");
 }
 function renderActiveLesson(): void {
  const lesson = lessons.find((item) => item.id === activeLessonId);
@@ -117,12 +92,8 @@ function renderActiveLesson(): void {
  title.textContent = `${lesson.id}. ${lesson.title}`;
  focus.textContent = lesson.focus;
  summary.textContent = lesson.summary;
-  pointList.innerHTML = lesson.keyPoints
+  pointList.innerHTML = lesson.keyPoints.map((item) => `<li>${item}</li>`).join("");
    .map((item) => `<li>${item}</li>`)
    .join("");
  starterCode.textContent = lesson.starterCode;
  answerCode.textContent = lesson.answerCode;
  renderOutput(lesson.runDemo());
  renderLessonList();
 }
@@ -138,14 +109,4 @@ nav.addEventListener("click", (event) => {
  renderActiveLesson();
 });
 runButton.addEventListener("click", () => {
  const lesson = lessons.find((item) => item.id === activeLessonId);
  if (!lesson) {
    return;
  }
  renderOutput(lesson.runDemo());
 });
 renderActiveLesson();
--- a/07-vue2/01-vue-instance-and-data/README.md
+++ b/07-vue2/01-vue-instance-and-data/README.md
@@ -0,0 +1,28 @@
 # 练习 1：Vue 实例和数据
 ## 目标
 学会写一个最基础的 Vue2 实例，并让页面内容跟着数据变化。
 ## 你要练什么
 - `new Vue()`
 - `el`
 - `data`
 - `methods`
 - 模板插值 `{{ }}`
 ## 任务
 请基于页面结构完成以下操作：
 - 显示课程标题和章节数量
 - 点击按钮后让学习人数加 1
 - 在控制台输出当前学习人数
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/01-vue-instance-and-data/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/01-vue-instance-and-data/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/01-vue-instance-and-data/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/01-vue-instance-and-data/answer.js)
--- a/07-vue2/01-vue-instance-and-data/answer.html
+++ b/07-vue2/01-vue-instance-and-data/answer.html
@@ -0,0 +1,24 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue 实例和数据</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f5f7fb; }
      .panel { max-width: 720px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dce5f2; }
      button { padding: 10px 16px; border: 0; border-radius: 999px; background: #2d6cdf; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>{{ title }}</h1>
      <p>本章共有 {{ lessonCount }} 个小节。</p>
      <p>当前学习人数：{{ learnerCount }}</p>
      <button type="button" @click="increaseLearner">加入学习</button>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/01-vue-instance-and-data/answer.js
+++ b/07-vue2/01-vue-instance-and-data/answer.js
@@ -0,0 +1,14 @@
 new Vue({
  el: "#app",
  data: {
    title: "Vue2 基础入门",
    lessonCount: 8,
    learnerCount: 12,
  },
  methods: {
    increaseLearner() {
      this.learnerCount += 1;
      console.log("当前学习人数：", this.learnerCount);
    },
  },
 });
--- a/07-vue2/01-vue-instance-and-data/starter.html
+++ b/07-vue2/01-vue-instance-and-data/starter.html
@@ -0,0 +1,24 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue 实例和数据</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f5f7fb; }
      .panel { max-width: 720px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dce5f2; }
      button { padding: 10px 16px; border: 0; border-radius: 999px; background: #2d6cdf; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>{{ title }}</h1>
      <p>本章共有 {{ lessonCount }} 个小节。</p>
      <p>当前学习人数：{{ learnerCount }}</p>
      <button type="button" @click="increaseLearner">加入学习</button>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/07-vue2/01-vue-instance-and-data/starter.js
+++ b/07-vue2/01-vue-instance-and-data/starter.js
@@ -0,0 +1,18 @@
 new Vue({
  el: "#app",
  data: {
    title: "Vue2 基础入门",
    lessonCount: 8,
    learnerCount: 12,
  },
  methods: {
    increaseLearner() {
      // 任务：
      // 1. learnerCount 加 1
      // 2. 在控制台输出最新人数
      this.learnerCount++
      console.log(this.learnerCount);
    },
  },
 });
--- a/07-vue2/02-template-bindings/README.md
+++ b/07-vue2/02-template-bindings/README.md
@@ -0,0 +1,27 @@
 # 练习 2：模板语法和绑定
 ## 目标
 学会把数据绑定到属性和事件上，而不是手动改 DOM。
 ## 你要练什么
 - `{{ }}`
 - `v-bind`
 - `v-on`
 - 事件方法
 ## 任务
 请基于页面结构完成以下操作：
 - 显示课程名和讲师名
 - 绑定图片地址和课程链接
 - 点击按钮后切换收藏状态
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/02-template-bindings/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/02-template-bindings/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/02-template-bindings/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/02-template-bindings/answer.js)
--- a/07-vue2/02-template-bindings/answer.html
+++ b/07-vue2/02-template-bindings/answer.html
@@ -0,0 +1,28 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>模板绑定</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f6f8fb; }
      .card { max-width: 680px; margin: 0 auto; padding: 24px; border-radius: 20px; background: #fff; border: 1px solid #dde6f5; }
      img { width: 100%; border-radius: 16px; }
      .link { display: inline-block; margin-top: 12px; color: #2d6cdf; }
      button { margin-top: 18px; padding: 10px 16px; border: 0; border-radius: 999px; background: #15233f; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="card">
      <h1>{{ courseTitle }}</h1>
      <p>讲师：{{ teacher }}</p>
      <img :src="coverUrl" :alt="courseTitle" />
      <a class="link" :href="courseLink" target="_blank">查看课程详情</a>
      <p>当前状态：{{ isCollected ? "已收藏" : "未收藏" }}</p>
      <button type="button" @click="toggleCollect">切换收藏状态</button>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/02-template-bindings/answer.js
+++ b/07-vue2/02-template-bindings/answer.js
@@ -0,0 +1,16 @@
 new Vue({
  el: "#app",
  data: {
    courseTitle: "Vue2 模板语法",
    teacher: "李老师",
    coverUrl: "https://picsum.photos/800/320?random=21",
    courseLink: "https://cn.vuejs.org/",
    isCollected: false,
  },
  methods: {
    toggleCollect() {
      this.isCollected = !this.isCollected;
      console.log("收藏状态：", this.isCollected ? "已收藏" : "未收藏");
    },
  },
 });
--- a/07-vue2/02-template-bindings/starter.html
+++ b/07-vue2/02-template-bindings/starter.html
@@ -0,0 +1,62 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
 <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>模板绑定</title>
  <style>
    body {
      margin: 0;
      padding: 32px;
      font-family: "PingFang SC", sans-serif;
      background: #f6f8fb;
    }
    .card {
      max-width: 680px;
      margin: 0 auto;
      padding: 24px;
      border-radius: 20px;
      background: #fff;
      border: 1px solid #dde6f5;
    }
    img {
      width: 100%;
      border-radius: 16px;
    }
    .link {
      display: inline-block;
      margin-top: 12px;
      color: #2d6cdf;
    }
    button {
      margin-top: 18px;
      padding: 10px 16px;
      border: 0;
      border-radius: 999px;
      background: #15233f;
      color: #fff;
      cursor: pointer;
    }
  </style>
 </head>
 <body>
  <section id="app" class="card">
    <h1>{{ courseTitle }}</h1>
    <p>讲师：{{ teacher }}</p>
    <img :src="coverUrl" :alt="courseTitle" />
    <a class="link" :href="courseLink" target="_blank">查看课程详情</a>
    <p>当前状态：{{ isCollected ? "已收藏" : "未收藏" }}</p>
    <button type="button" @click="toggleCollect">切换收藏状态</button>
  </section>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script src="./starter.js"></script>
 </body>
 </html>
--- a/07-vue2/02-template-bindings/starter.js
+++ b/07-vue2/02-template-bindings/starter.js
@@ -0,0 +1,20 @@
 new Vue({
  el: "#app",
  data: {
    courseTitle: "Vue2 模板语法",
    teacher: "李老师",
    coverUrl: "https://picsum.photos/800/320?random=21",
    courseLink: "https://cn.vuejs.org/",
    isCollected: false,
  },
  methods: {
    toggleCollect() {
      // 任务：
      // 1. 切换 isCollected
      // 2. 在控制台输出最新收藏状态
      this.isCollected = !this.isCollected
      console.log(this.isCollected);
    },
  },
 });
--- a/07-vue2/03-v-model-and-form/README.md
+++ b/07-vue2/03-v-model-and-form/README.md
@@ -0,0 +1,31 @@
 # 练习 3：v-model 和表单
 ## 目标
 学会用 `v-model` 处理输入、选择和实时预览。
 ## 你要练什么
 - `v-model`
 - 输入框
 - 多行文本
 - 下拉框
 - 单选框
 - 复选框
 ## 任务
 请基于页面结构完成以下操作：
 - 输入昵称并实时显示
 - 输入学习目标并实时显示
 - 选择当前阶段并显示结果
 - 选择偏好的学习节奏
 - 勾选已经掌握的基础能力
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/answer.js)
--- a/07-vue2/03-v-model-and-form/answer.html
+++ b/07-vue2/03-v-model-and-form/answer.html
@@ -0,0 +1,59 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>v-model 和表单</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f7f9fc; }
      .wrap { max-width: 760px; margin: 0 auto; display: grid; gap: 18px; }
      .card { padding: 22px; border-radius: 18px; background: #fff; border: 1px solid #dde5f3; }
      input, textarea, select { width: 100%; margin-top: 8px; padding: 12px; border-radius: 12px; border: 1px solid #cfd8ea; }
    </style>
  </head>
  <body>
    <section id="app" class="wrap">
      <article class="card">
        <label>
          昵称
          <input v-model="nickname" type="text" placeholder="请输入昵称" />
        </label>
        <label>
          学习目标
          <textarea v-model="goal" rows="4" placeholder="请输入学习目标"></textarea>
        </label>
        <label>
          当前阶段
          <select v-model="stage">
            <option value="入门">入门</option>
            <option value="进阶">进阶</option>
            <option value="项目实战">项目实战</option>
          </select>
        </label>
        <div style="margin-top: 16px;">
          <p>偏好的学习节奏</p>
          <label><input v-model="pace" type="radio" value="每天学习" /> 每天学习</label>
          <label><input v-model="pace" type="radio" value="每周集中学习" /> 每周集中学习</label>
        </div>
        <div style="margin-top: 16px;">
          <p>已掌握的基础能力</p>
          <label><input v-model="skills" type="checkbox" value="HTML" /> HTML</label>
          <label><input v-model="skills" type="checkbox" value="CSS" /> CSS</label>
          <label><input v-model="skills" type="checkbox" value="JavaScript" /> JavaScript</label>
        </div>
      </article>
      <article class="card">
        <h2>实时预览</h2>
        <p>昵称：{{ nickname || "未填写" }}</p>
        <p>学习目标：{{ goal || "还没有输入目标" }}</p>
        <p>当前阶段：{{ stage }}</p>
        <p>学习节奏：{{ pace }}</p>
        <p>已掌握：{{ skills.length ? skills.join("、") : "还没有勾选" }}</p>
      </article>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/03-v-model-and-form/answer.js
+++ b/07-vue2/03-v-model-and-form/answer.js
@@ -0,0 +1,10 @@
 new Vue({
  el: "#app",
  data: {
    nickname: "林晨",
    goal: "希望独立完成一个 Vue2 管理后台页面。",
    stage: "进阶",
    pace: "每周集中学习",
    skills: ["HTML", "CSS"],
  },
 });
--- a/07-vue2/03-v-model-and-form/starter.html
+++ b/07-vue2/03-v-model-and-form/starter.html
@@ -0,0 +1,59 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>v-model 和表单</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f7f9fc; }
      .wrap { max-width: 760px; margin: 0 auto; display: grid; gap: 18px; }
      .card { padding: 22px; border-radius: 18px; background: #fff; border: 1px solid #dde5f3; }
      input, textarea, select { width: 100%; margin-top: 8px; padding: 12px; border-radius: 12px; border: 1px solid #cfd8ea; }
    </style>
  </head>
  <body>
    <section id="app" class="wrap">
      <article class="card">
        <label>
          昵称
          <input v-model="nickname" type="text" placeholder="请输入昵称" />
        </label>
        <label>
          学习目标
          <textarea v-model="goal" rows="4" placeholder="请输入学习目标"></textarea>
        </label>
        <label>
          当前阶段
          <select v-model="stage">
            <option value="入门">入门</option>
            <option value="进阶">进阶</option>
            <option value="项目实战">项目实战</option>
          </select>
        </label>
        <div style="margin-top: 16px;">
          <p>偏好的学习节奏</p>
          <label><input v-model="pace" type="radio" value="每天学习" /> 每天学习</label>
          <label><input v-model="pace" type="radio" value="每周集中学习" /> 每周集中学习</label>
        </div>
        <div style="margin-top: 16px;">
          <p>已掌握的基础能力</p>
          <label><input v-model="skills" type="checkbox" value="HTML" /> HTML</label>
          <label><input v-model="skills" type="checkbox" value="CSS" /> CSS</label>
          <label><input v-model="skills" type="checkbox" value="JavaScript" /> JavaScript</label>
        </div>
      </article>
      <article class="card">
        <h2>实时预览</h2>
        <p>昵称：{{ nickname }}</p>
        <p>学习目标：{{ goal }}</p>
        <p>当前阶段：{{ stage }}</p>
        <p>学习节奏：{{ pace }}</p>
        <p>已掌握：{{ skills.join("、") }}</p>
      </article>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/07-vue2/03-v-model-and-form/starter.js
+++ b/07-vue2/03-v-model-and-form/starter.js
@@ -0,0 +1,10 @@
 new Vue({
  el: "#app",
  data: {
    nickname: "",
    goal: "",
    stage: "入门",
    pace: "每天学习",
    skills: [],
  },
 });
--- a/07-vue2/04-conditional-and-list-rendering/README.md
+++ b/07-vue2/04-conditional-and-list-rendering/README.md
@@ -0,0 +1,28 @@
 # 练习 4：条件渲染和列表渲染
 ## 目标
 学会根据状态显示不同内容，并用 `v-for` 渲染一组数据。
 ## 你要练什么
 - `v-if`
 - `v-else`
 - `v-show`
 - `v-for`
 - `:key`
 ## 任务
 请基于页面结构完成以下操作：
 - 切换“是否展开课程列表”
 - 根据是否付费显示不同文案
 - 用 `v-for` 渲染课程数组
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/answer.js)
--- a/07-vue2/04-conditional-and-list-rendering/answer.html
+++ b/07-vue2/04-conditional-and-list-rendering/answer.html
@@ -0,0 +1,32 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>条件渲染和列表渲染</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f5f8fc; }
      .panel { max-width: 760px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dbe4f4; }
      ul { padding-left: 18px; }
      button { padding: 10px 16px; border: 0; border-radius: 999px; background: #2f6ee5; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>Vue2 渲染练习</h1>
      <button type="button" @click="showList = !showList">切换课程列表</button>
      <p v-if="isPaid">你已经开通会员课程。</p>
      <p v-else>你还没有开通会员课程。</p>
      <ul v-show="showList">
        <li v-for="course in courses" :key="course.id">
          {{ course.title }} - {{ course.status }}
        </li>
      </ul>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/04-conditional-and-list-rendering/answer.js
+++ b/07-vue2/04-conditional-and-list-rendering/answer.js
@@ -0,0 +1,12 @@
 new Vue({
  el: "#app",
  data: {
    isPaid: true,
    showList: true,
    courses: [
      { id: 1, title: "Vue 实例", status: "已完成" },
      { id: 2, title: "指令系统", status: "学习中" },
      { id: 3, title: "组件通信", status: "未开始" },
    ],
  },
 });
--- a/07-vue2/04-conditional-and-list-rendering/starter.html
+++ b/07-vue2/04-conditional-and-list-rendering/starter.html
@@ -0,0 +1,32 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>条件渲染和列表渲染</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f5f8fc; }
      .panel { max-width: 760px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dbe4f4; }
      ul { padding-left: 18px; }
      button { padding: 10px 16px; border: 0; border-radius: 999px; background: #2f6ee5; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>Vue2 渲染练习</h1>
      <button type="button" @click="showList = !showList">切换课程列表</button>
      <p v-if="isPaid">你已经开通会员课程。</p>
      <p v-else>你还没有开通会员课程。</p>
      <ul v-show="showList">
        <li v-for="course in courses" :key="course.id">
          {{ course.title }} - {{ course.status }}
        </li>
      </ul>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/07-vue2/04-conditional-and-list-rendering/starter.js
+++ b/07-vue2/04-conditional-and-list-rendering/starter.js
@@ -0,0 +1,12 @@
 new Vue({
  el: "#app",
  data: {
    isPaid: false,
    showList: true,
    courses: [
      { id: 1, title: "Vue 实例", status: "已完成" },
      { id: 2, title: "指令系统", status: "学习中" },
      { id: 3, title: "组件通信", status: "未开始" },
    ],
  },
 });
--- a/07-vue2/05-computed-and-watch/README.md
+++ b/07-vue2/05-computed-and-watch/README.md
@@ -0,0 +1,27 @@
 # 练习 5：computed 和 watch
 ## 目标
 学会区分“根据已有数据推导结果”和“监听变化做额外动作”。
 ## 你要练什么
 - `computed`
 - `watch`
 - 数据推导
 - 监听输入变化
 ## 任务
 请基于页面结构完成以下操作：
 - 根据关键字过滤课程列表
 - 用 `computed` 计算过滤结果数量
 - 用 `watch` 在关键字变化时输出日志
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/05-computed-and-watch/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/05-computed-and-watch/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/05-computed-and-watch/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/05-computed-and-watch/answer.js)
--- a/07-vue2/05-computed-and-watch/answer.html
+++ b/07-vue2/05-computed-and-watch/answer.html
@@ -0,0 +1,28 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>computed 和 watch</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f7f9fd; }
      .panel { max-width: 760px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #d9e2f0; }
      input { width: 100%; padding: 12px; border-radius: 12px; border: 1px solid #ccd7e9; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>课程搜索</h1>
      <input v-model="keyword" type="text" placeholder="输入关键字" />
      <p>匹配数量：{{ matchedCount }}</p>
      <ul>
        <li v-for="item in filteredCourses" :key="item.id">
          {{ item.title }}
        </li>
      </ul>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/05-computed-and-watch/answer.js
+++ b/07-vue2/05-computed-and-watch/answer.js
@@ -0,0 +1,30 @@
 new Vue({
  el: "#app",
  data: {
    keyword: "",
    courses: [
      { id: 1, title: "Vue 实例入门" },
      { id: 2, title: "Vue 指令系统" },
      { id: 3, title: "组件通信实战" },
    ],
  },
  computed: {
    filteredCourses() {
      const value = this.keyword.trim().toLowerCase();
      if (!value) {
        return this.courses;
      }
      return this.courses.filter((item) => item.title.toLowerCase().includes(value));
    },
    matchedCount() {
      return this.filteredCourses.length;
    },
  },
  watch: {
    keyword(newValue) {
      console.log("关键字变化：", newValue);
    },
  },
 });
--- a/07-vue2/05-computed-and-watch/starter.html
+++ b/07-vue2/05-computed-and-watch/starter.html
@@ -0,0 +1,50 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
 <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>computed 和 watch</title>
  <style>
    body {
      margin: 0;
      padding: 32px;
      font-family: "PingFang SC", sans-serif;
      background: #f7f9fd;
    }
    .panel {
      max-width: 760px;
      margin: 0 auto;
      padding: 24px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid #d9e2f0;
    }
    input {
      width: 100%;
      padding: 12px;
      border-radius: 12px;
      border: 1px solid #ccd7e9;
    }
  </style>
 </head>
 <body>
  <section id="app" class="panel">
    <h1>课程搜索</h1>
    <input v-model="keyword" type="text" placeholder="输入关键字" />
    <p>匹配数量：{{ matchedCount }}</p>
    <ul>
      <li v-for="item in filteredCourses" :key="item.id">
        {{ item.title }}
      </li>
    </ul>
  </section>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script src="./starter.js"></script>
 </body>
 </html>
--- a/07-vue2/05-computed-and-watch/starter.js
+++ b/07-vue2/05-computed-and-watch/starter.js
@@ -0,0 +1,29 @@
 new Vue({
  el: "#app",
  data: {
    keyword: "",
    courses: [
      { id: 1, title: "Vue 实例入门" },
      { id: 2, title: "Vue 指令系统" },
      { id: 3, title: "组件通信实战" },
    ],
  },
  computed: {
    filteredCourses() {
      // 任务：返回过滤后的课程列表
      const value = this.keyword.trim().toUpperCase()
      return this.courses.filter(item => item.title.toUpperCase().includes(value))
    },
    matchedCount() {
      // 任务：返回 filteredCourses 的数量
      return this.filteredCourses.length;
    },
  },
  watch: {
    keyword(newValue) {
      // 任务：在控制台输出关键字变化
      console.log(`筛选关键词：${newValue}`);
    },
  },
 });
--- a/07-vue2/06-class-style-and-event/README.md
+++ b/07-vue2/06-class-style-and-event/README.md
@@ -0,0 +1,27 @@
 # 练习 6：动态类名、样式和事件
 ## 目标
 学会让组件状态直接影响样式和交互反馈。
 ## 你要练什么
 - `:class`
 - `:style`
 - `v-on`
 - 点击切换状态
 ## 任务
 请基于页面结构完成以下操作：
 - 点击卡片切换激活状态
 - 根据激活状态切换类名
 - 根据进度值动态改变进度条宽度
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/06-class-style-and-event/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/06-class-style-and-event/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/06-class-style-and-event/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/06-class-style-and-event/answer.js)
--- a/07-vue2/06-class-style-and-event/answer.html
+++ b/07-vue2/06-class-style-and-event/answer.html
@@ -0,0 +1,31 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>动态类名、样式和事件</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f4f8fb; }
      .panel { max-width: 760px; margin: 0 auto; }
      .card { padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #d8e4f3; cursor: pointer; transition: all .2s ease; }
      .card.active { border-color: #2d6cdf; background: #eef4ff; }
      .progress-track { height: 12px; margin-top: 16px; border-radius: 999px; background: #e6edf8; overflow: hidden; }
      .progress-bar { height: 100%; background: linear-gradient(90deg, #2d6cdf, #58a2ff); }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <article class="card" :class="{ active: isActive }" @click="toggleCard">
        <h1>{{ title }}</h1>
        <p>{{ isActive ? "当前卡片已激活" : "点击卡片激活它" }}</p>
        <div class="progress-track">
          <div class="progress-bar" :style="{ width: progress + '%' }"></div>
        </div>
        <p>当前进度：{{ progress }}%</p>
      </article>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/06-class-style-and-event/answer.js
+++ b/07-vue2/06-class-style-and-event/answer.js
@@ -0,0 +1,14 @@
 new Vue({
  el: "#app",
  data: {
    title: "动态样式练习",
    isActive: false,
    progress: 35,
  },
  methods: {
    toggleCard() {
      this.isActive = !this.isActive;
      this.progress = this.isActive ? 80 : 35;
    },
  },
 });
--- a/07-vue2/06-class-style-and-event/starter.html
+++ b/07-vue2/06-class-style-and-event/starter.html
@@ -0,0 +1,66 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
 <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>动态类名、样式和事件</title>
  <style>
    body {
      margin: 0;
      padding: 32px;
      font-family: "PingFang SC", sans-serif;
      background: #f4f8fb;
    }
    .panel {
      max-width: 760px;
      margin: 0 auto;
    }
    .card {
      padding: 24px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid #d8e4f3;
      cursor: pointer;
      transition: all .2s ease;
    }
    .card.active {
      border-color: #2d6cdf;
      background: #eef4ff;
    }
    .progress-track {
      height: 12px;
      margin-top: 16px;
      border-radius: 999px;
      background: #e6edf8;
      overflow: hidden;
    }
    .progress-bar {
      height: 100%;
      background: linear-gradient(90deg, #2d6cdf, #58a2ff);
    }
  </style>
 </head>
 <body>
  <section id="app" class="panel">
    <article class="card" :class="{ active: isActive }" @click="toggleCard">
      <h1>{{ title }}</h1>
      <p>{{ isActive ? "当前卡片已激活" : "点击卡片激活它" }}</p>
      <div class="progress-track">
        <div class="progress-bar" :style="{ width: progress + '%' }"></div>
      </div>
      <p>当前进度：{{ progress }}%</p>
    </article>
  </section>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script src="./starter.js"></script>
 </body>
 </html>
--- a/07-vue2/06-class-style-and-event/starter.js
+++ b/07-vue2/06-class-style-and-event/starter.js
@@ -0,0 +1,22 @@
 new Vue({
  el: "#app",
  data: {
    title: "动态样式练习",
    isActive: false,
    progress: 35,
  },
  methods: {
    toggleCard() {
      // 任务：
      // 1. 切换 isActive
      this.isActive = !this.isActive
      // 2. 如果激活了，让 progress 增加到 80
      if (this.isActive) {
        this.progress = 80
      } else {
        this.progress = 35
      }
      // 3. 如果取消激活，让 progress 回到 35
    },
  },
 });
--- a/07-vue2/07-lifecycle-and-async/README.md
+++ b/07-vue2/07-lifecycle-and-async/README.md
@@ -0,0 +1,31 @@
 # 练习 7：生命周期和异步更新
 ## 目标
 学会在合适的生命周期里加载数据，并理解页面更新的时机。
 ## 你要练什么
 - `created`
 - `mounted`
 - `updated`
 - `beforeDestroy`
 - `destroyed`
 - 模拟异步请求
 ## 任务
 请基于页面结构完成以下操作：
 - 进入页面时显示 loading
 - 在 `mounted` 里模拟异步获取课程数据
 - 数据返回后渲染课程列表
 - 在 `updated` 里输出更新日志
 - 点击按钮时销毁当前实例，并观察销毁日志
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/07-lifecycle-and-async/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/07-lifecycle-and-async/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/07-lifecycle-and-async/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/07-lifecycle-and-async/answer.js)
--- a/07-vue2/07-lifecycle-and-async/answer.html
+++ b/07-vue2/07-lifecycle-and-async/answer.html
@@ -0,0 +1,25 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>生命周期和异步更新</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f6f8fb; }
      .panel { max-width: 760px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dce4f1; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>生命周期练习</h1>
      <button type="button" @click="destroyInstance">销毁当前实例</button>
      <p v-if="loading">数据加载中...</p>
      <ul v-else>
        <li v-for="item in courses" :key="item.id">{{ item.title }}</li>
      </ul>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/07-lifecycle-and-async/answer.js
+++ b/07-vue2/07-lifecycle-and-async/answer.js
@@ -0,0 +1,36 @@
 new Vue({
  el: "#app",
  data: {
    loading: true,
    courses: [],
  },
  created() {
    console.log("created: 实例已经创建");
  },
  mounted() {
    console.log("mounted: 页面已经挂载");
    setTimeout(() => {
      this.courses = [
        { id: 1, title: "生命周期基础" },
        { id: 2, title: "异步数据渲染" },
        { id: 3, title: "组件更新时机" },
      ];
      this.loading = false;
    }, 1000);
  },
  updated() {
    console.log("updated: 页面数据已经更新");
  },
  beforeDestroy() {
    console.log("beforeDestroy: 实例即将销毁");
  },
  destroyed() {
    console.log("destroyed: 实例已经销毁");
  },
  methods: {
    destroyInstance() {
      this.$destroy();
    },
  },
 });
--- a/07-vue2/07-lifecycle-and-async/starter.html
+++ b/07-vue2/07-lifecycle-and-async/starter.html
@@ -0,0 +1,25 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>生命周期和异步更新</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f6f8fb; }
      .panel { max-width: 760px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dce4f1; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>生命周期练习</h1>
      <button type="button" @click="destroyInstance">销毁当前实例</button>
      <p v-if="loading">数据加载中...</p>
      <ul v-else>
        <li v-for="item in courses" :key="item.id">{{ item.title }}</li>
      </ul>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/07-vue2/07-lifecycle-and-async/starter.js
+++ b/07-vue2/07-lifecycle-and-async/starter.js
@@ -0,0 +1,48 @@
 new Vue({
  el: "#app",
  data: {
    loading: true,
    courses: [],
  },
  created() {
    console.log("created: 实例已经创建");
  },
  mounted() {
    // 任务：
    // 1. 模拟异步请求
    // 2. 1 秒后给 courses 赋值
    // 3. loading 改成 false
    console.log("1");
    const thiz = this
    setTimeout(function () {
      thiz.courses = [
        { id: 1, title: 'HTML' },
        { id: 2, title: 'CSS' },
        { id: 3, title: 'JS' }
      ]
      thiz.loading = false
    }, 1000)
  },
  updated() {
    // 任务：在控制台输出 updated 日志
    console.log("更新");
  },
  beforeDestroy() {
    // 任务：在控制台输出 beforeDestroy 日志
    console.log("已销毁");
  },
  destroyed() {
    // 任务：在控制台输出 destroyed 日志
    console.log("销毁完成");
  },
  methods: {
    destroyInstance() {
      // 任务：调用 this.$destroy()
      this.$destroy()
    },
  },
 });
--- a/07-vue2/08-components-communication-and-final/README.md
+++ b/07-vue2/08-components-communication-and-final/README.md
@@ -0,0 +1,33 @@
 # 练习 8：组件通信与综合练习
 ## 目标
 把 Vue2 最核心的组件能力串起来，完成一个小型页面。
 ## 你要练什么
 - 组件注册（全局 / 局部）
 - `props`
 - `props` 校验
 - `$emit`
 - `slot`
 - `ref`
 ## 任务
 请基于页面结构完成以下操作：
 - 把课程卡片拆成子组件
 - 注册一个全局角标组件
 - 父组件通过 `props` 传课程数据
 - 给 `props` 补上类型、必填、默认值或校验规则
 - 子组件点击按钮后通过 `$emit` 通知父组件切换状态
 - 用 `slot` 自定义按钮文案
 - 用 `ref` 聚焦输入框
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/08-components-communication-and-final/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/08-components-communication-and-final/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/08-components-communication-and-final/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/08-components-communication-and-final/answer.js)
--- a/07-vue2/08-components-communication-and-final/answer.html
+++ b/07-vue2/08-components-communication-and-final/answer.html
@@ -0,0 +1,43 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>组件通信与综合练习</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f4f7fb; }
      .wrap { max-width: 860px; margin: 0 auto; display: grid; gap: 16px; }
      .toolbar, .card { padding: 20px; border-radius: 18px; background: #fff; border: 1px solid #d9e3f2; }
      .list { display: grid; gap: 14px; }
      button { padding: 10px 14px; border: 0; border-radius: 999px; background: #2d6cdf; color: #fff; cursor: pointer; }
      input { width: 100%; padding: 12px; border-radius: 12px; border: 1px solid #cfd8e8; }
      .done { color: #1f8f54; }
    </style>
  </head>
  <body>
    <section id="app" class="wrap">
      <article class="toolbar">
        <h1>Vue2 综合练习</h1>
        <input ref="keywordInput" v-model="keyword" type="text" placeholder="输入关键字过滤课程" />
        <button type="button" @click="focusInput">聚焦输入框</button>
      </article>
      <section class="list">
        <course-card
          v-for="course in filteredCourses"
          :key="course.id"
          :course="course"
          theme="accent"
          @toggle="toggleCourse"
        >
          <template v-slot:action>
            切换完成状态
          </template>
        </course-card>
      </section>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/08-components-communication-and-final/answer.js
+++ b/07-vue2/08-components-communication-and-final/answer.js
@@ -0,0 +1,80 @@
 Vue.component("course-badge", {
  props: {
    label: {
      type: String,
      default: "默认角标",
    },
  },
  template: `<span style="display:inline-block;margin-bottom:8px;padding:4px 10px;border-radius:999px;background:#eef4ff;color:#2d6cdf;">{{ label }}</span>`,
 });
 const CourseCard = {
  props: {
    course: {
      type: Object,
      required: true,
    },
    theme: {
      type: String,
      default: "normal",
      validator(value) {
        return ["normal", "accent"].includes(value);
      },
    },
  },
  template: `
    <article class="card" :style="theme === 'accent' ? 'border-color:#2d6cdf;' : ''">
      <course-badge :label="course.level"></course-badge>
      <h2>{{ course.title }}</h2>
      <p :class="{ done: course.finished }">
        {{ course.finished ? "已完成" : "学习中" }}
      </p>
      <button type="button" @click="$emit('toggle', course.id)">
        <slot name="action">操作</slot>
      </button>
    </article>
  `,
 };
 new Vue({
  el: "#app",
  components: {
    CourseCard,
  },
  data: {
    keyword: "",
    courses: [
      { id: 1, title: "Vue 实例", finished: true, level: "基础" },
      { id: 2, title: "模板语法", finished: false, level: "基础" },
      { id: 3, title: "组件通信", finished: false, level: "进阶" },
    ],
  },
  computed: {
    filteredCourses() {
      const value = this.keyword.trim().toLowerCase();
      if (!value) {
        return this.courses;
      }
      return this.courses.filter((course) => course.title.toLowerCase().includes(value));
    },
  },
  methods: {
    toggleCourse(courseId) {
      this.courses = this.courses.map((course) => {
        if (course.id === courseId) {
          return {
            ...course,
            finished: !course.finished,
          };
        }
        return course;
      });
    },
    focusInput() {
      this.$refs.keywordInput.focus();
    },
  },
 });
--- a/07-vue2/08-components-communication-and-final/starter.html
+++ b/07-vue2/08-components-communication-and-final/starter.html
@@ -0,0 +1,43 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>组件通信与综合练习</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f4f7fb; }
      .wrap { max-width: 860px; margin: 0 auto; display: grid; gap: 16px; }
      .toolbar, .card { padding: 20px; border-radius: 18px; background: #fff; border: 1px solid #d9e3f2; }
      .list { display: grid; gap: 14px; }
      button { padding: 10px 14px; border: 0; border-radius: 999px; background: #2d6cdf; color: #fff; cursor: pointer; }
      input { width: 100%; padding: 12px; border-radius: 12px; border: 1px solid #cfd8e8; }
      .done { color: #1f8f54; }
    </style>
  </head>
  <body>
    <section id="app" class="wrap">
      <article class="toolbar">
        <h1>Vue2 综合练习</h1>
        <input ref="keywordInput" v-model="keyword" type="text" placeholder="输入关键字过滤课程" />
        <button type="button" @click="focusInput">聚焦输入框</button>
      </article>
      <section class="list">
        <course-card
          v-for="course in filteredCourses"
          :key="course.id"
          :course="course"
          theme="accent"
          @toggle="toggleCourse"
        >
          <template v-slot:action>
            切换完成状态
          </template>
        </course-card>
      </section>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/07-vue2/08-components-communication-and-final/starter.js
+++ b/07-vue2/08-components-communication-and-final/starter.js
@@ -0,0 +1,74 @@
 Vue.component("course-badge", {
  props: {
    label: {
      type: String,
      default: "默认角标",
    },
  },
  template: `<span style="display:inline-block;margin-bottom:8px;padding:4px 10px;border-radius:999px;background:#eef4ff;color:#2d6cdf;">{{ label }}</span>`,
 });
 const CourseCard = {
  props: {
    course: {
      type: Object,
      required: true,
    },
    theme: {
      type: String,
      default: "normal",
      validator(value) {
        return ["normal", "accent"].includes(value);
      },
    },
  },
  template: `
    <article class="card" :style="theme === 'accent' ? 'border-color:#2d6cdf;' : ''">
      <course-badge :label="course.level"></course-badge>
      <h2>{{ course.title }}</h2>
      <p :class="{ done: course.finished }">
        {{ course.finished ? "已完成" : "学习中" }}
      </p>
      <button type="button" @click="$emit('toggle', course.id)">
        <slot name="action">操作</slot>
      </button>
    </article>
  `,
 };
 new Vue({
  el: "#app",
  components: {
    CourseCard,
  },
  data: {
    keyword: "",
    courses: [
      { id: 1, title: "Vue 实例", finished: true, level: "基础" },
      { id: 2, title: "模板语法", finished: false, level: "基础" },
      { id: 3, title: "组件通信", finished: false, level: "进阶" },
    ],
  },
  computed: {
    filteredCourses() {
      // 任务：根据 keyword 过滤课程列表
      let value = this.keyword.trim().toUpperCase()
      return this.courses.filter(item => item.title.toUpperCase().includes(value))
    },
  },
  methods: {
    toggleCourse(courseId) {
      // 任务：根据 courseId 切换 finished
      const a = this.courses.find(item => {
        if (item.id === courseId) {
          item.finished = !item.finished
        }
        return;
      })
    },
    focusInput() {
      // 任务：通过 ref 聚焦输入框
      this.$refs.keywordInput.focus()
    },
  },
 });
--- a/07-vue2/09-final-course-dashboard/README.md
+++ b/07-vue2/09-final-course-dashboard/README.md
@@ -0,0 +1,44 @@
 # 练习 9：Vue2 综合课程管理面板
 ## 目标
 把 Vue2 入门阶段最关键的能力串起来，完成一个带搜索、筛选、统计、组件通信的课程管理面板。
 ## 你要练什么
 - `new Vue()`
 - `data`
 - `methods`
 - `computed`
 - `watch`
 - `v-model`
 - `v-if`
 - `v-show`
 - `v-for`
 - `:key`
 - `:class`
 - `props`
 - `props` 校验
 - `$emit`
 - `slot`
 - `ref`
 ## 任务
 请基于页面结构完成以下操作：
 - 输入关键字过滤课程名称
 - 用下拉框切换“全部 / 已完成 / 学习中”
 - 点击按钮让搜索框获得焦点
 - 用子组件渲染每一项课程
 - 子组件通过 `$emit` 通知父组件切换完成状态
 - 没有匹配结果时显示空状态
 - 页面底部显示总数、已完成数、当前筛选数
 - 在 `watch` 里输出关键字变化日志
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/09-final-course-dashboard/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/09-final-course-dashboard/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/09-final-course-dashboard/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/09-final-course-dashboard/answer.js)
--- a/07-vue2/09-final-course-dashboard/answer.html
+++ b/07-vue2/09-final-course-dashboard/answer.html
@@ -0,0 +1,66 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue2 综合课程管理面板</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f4f7fb; }
      .page { max-width: 960px; margin: 0 auto; display: grid; gap: 18px; }
      .panel { padding: 22px; border-radius: 20px; background: #fff; border: 1px solid #d9e4f1; }
      .toolbar { display: grid; grid-template-columns: 1fr 180px 160px; gap: 12px; }
      input, select, button { padding: 12px 14px; border-radius: 12px; border: 1px solid #cad6e8; font: inherit; }
      button { border: 0; background: #2d6cdf; color: #fff; cursor: pointer; }
      .list { display: grid; gap: 14px; }
      .course-card { padding: 18px; border-radius: 16px; border: 1px solid #dbe4f1; background: #fbfcfe; }
      .course-card.is-done { border-color: #6cc18a; background: #f3fbf6; }
      .meta { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
      .badge { display: inline-flex; padding: 4px 10px; border-radius: 999px; background: #edf4ff; color: #2d6cdf; font-size: 12px; }
      .badge.advanced { background: #fff0e8; color: #d96a18; }
      .stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
      .empty { padding: 18px; border-radius: 16px; background: #fff6e8; color: #a06200; }
    </style>
  </head>
  <body>
    <section id="app" class="page">
      <article class="panel">
        <h1>Vue2 课程管理面板</h1>
        <div class="toolbar">
          <input ref="searchInput" v-model="keyword" type="text" placeholder="输入课程关键字" />
          <select v-model="statusFilter">
            <option value="all">全部</option>
            <option value="done">已完成</option>
            <option value="doing">学习中</option>
          </select>
          <button type="button" @click="focusSearch">聚焦搜索框</button>
        </div>
      </article>
      <section class="panel">
        <div v-if="!filteredCourses.length" class="empty">暂无匹配结果</div>
        <div v-show="filteredCourses.length" class="list">
          <course-item
            v-for="course in filteredCourses"
            :key="course.id"
            :course="course"
            @toggle="toggleCourse"
          >
            <template v-slot:action>
              切换完成状态
            </template>
          </course-item>
        </div>
      </section>
      <footer class="panel stats">
        <div>总课程数：{{ totalCount }}</div>
        <div>已完成数：{{ finishedCount }}</div>
        <div>当前筛选数：{{ visibleCount }}</div>
      </footer>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/07-vue2/09-final-course-dashboard/answer.js
+++ b/07-vue2/09-final-course-dashboard/answer.js
@@ -0,0 +1,99 @@
 Vue.component("level-badge", {
  props: {
    level: {
      type: String,
      default: "基础",
    },
  },
  computed: {
    badgeClass() {
      return this.level === "进阶" ? "badge advanced" : "badge";
    },
  },
  template: `<span :class="badgeClass">{{ level }}</span>`,
 });
 const CourseItem = {
  props: {
    course: {
      type: Object,
      required: true,
    },
  },
  template: `
    <article class="course-card" :class="{ 'is-done': course.finished }">
      <div class="meta">
        <level-badge :level="course.level"></level-badge>
        <strong>{{ course.title }}</strong>
      </div>
      <p>{{ course.finished ? "当前已完成" : "当前学习中" }}</p>
      <button type="button" @click="$emit('toggle', course.id)">
        <slot name="action">操作</slot>
      </button>
    </article>
  `,
 };
 new Vue({
  el: "#app",
  components: {
    CourseItem,
  },
  data: {
    keyword: "",
    statusFilter: "all",
    courses: [
      { id: 1, title: "Vue 实例基础", finished: true, level: "基础" },
      { id: 2, title: "模板语法与指令", finished: false, level: "基础" },
      { id: 3, title: "组件通信实战", finished: false, level: "进阶" },
      { id: 4, title: "生命周期和异步", finished: true, level: "进阶" },
    ],
  },
  computed: {
    filteredCourses() {
      const keyword = this.keyword.trim().toLowerCase();
      return this.courses.filter((course) => {
        const matchStatus =
          this.statusFilter === "all" ||
          (this.statusFilter === "done" && course.finished) ||
          (this.statusFilter === "doing" && !course.finished);
        const matchKeyword = !keyword || course.title.toLowerCase().includes(keyword);
        return matchStatus && matchKeyword;
      });
    },
    totalCount() {
      return this.courses.length;
    },
    finishedCount() {
      return this.courses.filter((course) => course.finished).length;
    },
    visibleCount() {
      return this.filteredCourses.length;
    },
  },
  watch: {
    keyword(newValue) {
      console.log("搜索关键字变化：", newValue);
    },
  },
  methods: {
    toggleCourse(courseId) {
      this.courses = this.courses.map((course) => {
        if (course.id === courseId) {
          return {
            ...course,
            finished: !course.finished,
          };
        }
        return course;
      });
    },
    focusSearch() {
      this.$refs.searchInput.focus();
    },
  },
 });
--- a/07-vue2/09-final-course-dashboard/starter.html
+++ b/07-vue2/09-final-course-dashboard/starter.html
@@ -0,0 +1,65 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue2 综合课程管理面板</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f4f7fb; }
      .page { max-width: 960px; margin: 0 auto; display: grid; gap: 18px; }
      .panel { padding: 22px; border-radius: 20px; background: #fff; border: 1px solid #d9e4f1; }
      .toolbar { display: grid; grid-template-columns: 1fr 180px 160px; gap: 12px; }
      input, select, button { padding: 12px 14px; border-radius: 12px; border: 1px solid #cad6e8; font: inherit; }
      button { border: 0; background: #2d6cdf; color: #fff; cursor: pointer; }
      .list { display: grid; gap: 14px; }
      .course-card { padding: 18px; border-radius: 16px; border: 1px solid #dbe4f1; background: #fbfcfe; }
      .course-card.is-done { border-color: #6cc18a; background: #f3fbf6; }
      .meta { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
      .badge { display: inline-flex; padding: 4px 10px; border-radius: 999px; background: #edf4ff; color: #2d6cdf; font-size: 12px; }
      .stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
      .empty { padding: 18px; border-radius: 16px; background: #fff6e8; color: #a06200; }
    </style>
  </head>
  <body>
    <section id="app" class="page">
      <article class="panel">
        <h1>Vue2 课程管理面板</h1>
        <div class="toolbar">
          <input ref="searchInput" v-model="keyword" type="text" placeholder="输入课程关键字" />
          <select v-model="statusFilter">
            <option value="all">全部</option>
            <option value="done">已完成</option>
            <option value="doing">学习中</option>
          </select>
          <button type="button" @click="focusSearch">聚焦搜索框</button>
        </div>
      </article>
      <section class="panel">
        <div v-if="!filteredCourses.length" class="empty">暂无匹配结果</div>
        <div v-show="filteredCourses.length" class="list">
          <course-item
            v-for="course in filteredCourses"
            :key="course.id"
            :course="course"
            @toggle="toggleCourse"
          >
            <template v-slot:action>
              切换完成状态
            </template>
          </course-item>
        </div>
      </section>
      <footer class="panel stats">
        <div>总课程数：{{ totalCount }}</div>
        <div>已完成数：{{ finishedCount }}</div>
        <div>当前筛选数：{{ visibleCount }}</div>
      </footer>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/07-vue2/09-final-course-dashboard/starter.js
+++ b/07-vue2/09-final-course-dashboard/starter.js
@@ -0,0 +1,97 @@
 Vue.component("level-badge", {
  props: {
    level: {
      type: String,
      default: "基础",
    },
  },
  template: `<span class="badge">{{ level }}</span>`,
 });
 const CourseItem = {
  props: {
    course: {
      type: Object,
      required: true,
    },
  },
  template: `
    <article class="course-card" :class="{ 'is-done': course.finished }">
      <div class="meta">
        <level-badge :level="course.level"></level-badge>
        <strong>{{ course.title }}</strong>
      </div>
      <p>{{ course.finished ? "当前已完成" : "当前学习中" }}</p>
      <button type="button" @click="$emit('toggle', course.id)">
        <slot name="action">操作</slot>
      </button>
    </article>
  `,
 };
 new Vue({
  el: "#app",
  components: {
    CourseItem,
  },
  data: {
    keyword: "",
    statusFilter: "all",
    courses: [
      { id: 1, title: "Vue 实例基础", finished: true, level: "基础" },
      { id: 2, title: "模板语法与指令", finished: false, level: "基础" },
      { id: 3, title: "组件通信实战", finished: false, level: "进阶" },
      { id: 4, title: "生命周期和异步", finished: true, level: "进阶" },
    ],
  },
  computed: {
    filteredCourses() {
      // 任务：
      // 1. 先按 statusFilter 过滤
      // 2. 再按 keyword 过滤标题
      let value = this.keyword.trim().toUpperCase()
      let a
      if (this.statusFilter === "all") {
        a = this.courses.filter(item => item.title.toUpperCase().includes(value))
      } else if (this.statusFilter === "done") {
        const b = this.courses.filter(item => item.finished === true)
        a = b.filter(item => item.title.toUpperCase().includes(value))
      } else if (this.statusFilter === "doing") {
        const b = this.courses.filter(item => item.finished === false)
        a = b.filter(item => item.title.toUpperCase().includes(value))
      }
      return a
    },
    totalCount() {
      return this.courses.length;
    },
    finishedCount() {
      // 任务：返回已完成课程数量
      const b = this.courses.filter(item => item.finished === true)
      return b.length
    },
    visibleCount() {
      // 任务：返回当前筛选后的数量
      const a = this.filteredCourses
      return a.length;
    },
  },
  watch: {
    keyword(newValue) {
      // 任务：在控制台输出关键字变化
      console.log(`关键词：${newValue}`);
    },
  },
  methods: {
    toggleCourse(courseId) {
      // 任务：根据 courseId 切换 finished
      const a = this.courses.find(item => item.id === courseId)
      a.finished = !a.finished
    },
    focusSearch() {
      // 任务：通过 ref 聚焦输入框
      this.$refs.searchInput.focus()
    },
  },
 });
--- a/07-vue2/README.md
+++ b/07-vue2/README.md
@@ -0,0 +1,158 @@
 # Vue2（理解框架思想）
 这部分只解决一个问题：你能不能从“手写 DOM”切换到“数据驱动视图”的思维方式，并理解 Vue2 为什么能让页面开发更高效。
 ## 学完后你应该掌握
 - Vue2 是什么，为什么说它是渐进式框架
 - `new Vue()`、`el`、`data`、`methods` 的基础写法
 - 模板插值 `{{ }}`
 - `v-bind` 和 `v-on`
 - `v-model` 做表单双向绑定，包括文本、单选和复选
 - `v-if`、`v-show`、`v-for`、`:key`
 - `computed` 和 `watch` 的基本区别
 - `:class` 和 `:style` 的动态绑定
 - 生命周期里的 `created`、`mounted`、`updated`、`beforeDestroy`、`destroyed`
 - 组件、`props`、`props` 校验、`$emit`
 - 插槽 `slot`
 - `ref` 的基本用法
 - 如何把这些能力组合成一个 Vue2 小页面
 ## 这一章在解决什么
 Vue2 不是教你再多学一套“新语法”，而是帮你把页面开发的思路改掉。
 它回答的是：
 - 页面内容为什么应该由数据决定
 - 一个点击事件为什么不一定要手动改 DOM
 - 一段重复结构为什么应该交给 `v-for`
 - 一块页面为什么应该拆成组件
 - 父组件和子组件之间怎么传数据和传事件
 ## 必须建立的 6 个核心意识
 ### 1. 视图应该跟着数据走
 不是先找 DOM 再改内容，而是先改数据，让页面自动更新。
 ### 2. 指令是模板和数据之间的桥
 像 `v-bind`、`v-on`、`v-model`、`v-if`、`v-for` 这些指令，本质上是在描述“数据怎么影响页面”。
 ### 3. 计算属性更适合“基于已有数据得出结果”
 如果一个值可以从别的数据推导出来，优先考虑 `computed`。
 ### 4. `watch` 更适合“监听变化后做副作用”
 比如发请求、写日志、同步别的状态。
 ### 5. 组件化不是拆文件，而是拆职责
 一个组件只关心一块明确的界面和交互。
 ### 6. 父子通信是 Vue 开发主线
 - 父组件通过 `props` 往下传数据
 - 子组件通过 `$emit` 往上通知事件
 ## 全部知识点清单
 ### 基础认知
 - Vue2 渐进式框架
 - 数据驱动视图
 - 声明式渲染
 ### 实例基础
 - `new Vue()`
 - `el`
 - `data`
 - `methods`
 ### 模板与指令
 - `{{ }}`
 - `v-bind`
 - `v-on`
 - `v-model`
 - `radio`
 - `checkbox`
 - `v-if`
 - `v-else`
 - `v-show`
 - `v-for`
 - `:key`
 ### 响应式进阶
 - `computed`
 - `watch`
 - `:class`
 - `:style`
 ### 生命周期
 - `created`
 - `mounted`
 - `updated`
 - `beforeDestroy`
 - `destroyed`
 ### 组件通信
 - 组件注册（全局 / 局部）
 - `props`
 - `props` 校验
 - `$emit`
 - `slot`
 - `ref`
 - 综合页面组织能力
 ## 学习顺序
 1. Vue 实例和数据绑定
 2. 模板语法和事件绑定
 3. 表单双向绑定
 4. 条件渲染和列表渲染
 5. `computed` 和 `watch`
 6. 动态类名、样式和事件交互
 7. 生命周期和异步更新
 8. 组件通信
 9. 综合课程管理面板
 ## 练习目录
 - [01-vue-instance-and-data/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/01-vue-instance-and-data/README.md)
 - [02-template-bindings/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/02-template-bindings/README.md)
 - [03-v-model-and-form/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/README.md)
 - [04-conditional-and-list-rendering/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/README.md)
 - [05-computed-and-watch/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/05-computed-and-watch/README.md)
 - [06-class-style-and-event/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/06-class-style-and-event/README.md)
 - [07-lifecycle-and-async/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/07-lifecycle-and-async/README.md)
 - [08-components-communication-and-final/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/08-components-communication-and-final/README.md)
 - [09-final-course-dashboard/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/09-final-course-dashboard/README.md)
 ## 过关标准
 如果你能独立做到下面这些，就说明这一章已经基本过关：
 - 能写出一个基础 Vue2 实例
 - 能用模板语法展示数据
 - 能用 `v-model` 处理输入
 - 能用 `v-model` 处理单选框和复选框
 - 能用 `v-if`、`v-show`、`v-for` 组织页面
 - 能分清 `computed` 和 `watch`
 - 能写出基础组件并使用 `props` / `props` 校验 / `$emit`
 - 能理解插槽和 `ref` 的常见用途
 - 能知道 Vue 实例销毁前后会经过哪些生命周期
 - 能完成一个带组件通信的小页面
 ## 学习建议
 - 学 Vue2 时先不要急着记所有 API，先抓住“数据变，页面跟着变”这条主线
 - 遇到页面不更新时，先看是不是数据没有改到
 - 遇到组件通信问题时，先分清“数据往下传”还是“事件往上抛”
 - 学组件时先从 2 个组件开始，不要一上来拆太细
--- a/08-vue3/01-create-app-and-ref/README.md
+++ b/08-vue3/01-create-app-and-ref/README.md
@@ -0,0 +1,23 @@
 # 练习 1：createApp、setup 和 ref
 ## 目标
 学会用 Vue3 的 `createApp` 和 `setup()` 启动页面，并用 `ref` 创建最基础的响应式数据。
 ## 你要练什么
 - `createApp`
 - `setup()`
 - `ref`
 - 模板插值
 ## 任务
 - 显示页面标题和学习人数
 - 点击按钮后让人数加 1
 - 在控制台输出最新人数
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/01-create-app-and-ref/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/01-create-app-and-ref/starter.js)
--- a/08-vue3/01-create-app-and-ref/starter.html
+++ b/08-vue3/01-create-app-and-ref/starter.html
@@ -0,0 +1,23 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>createApp、setup 和 ref</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f5f7fb; }
      .panel { max-width: 720px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dce5f2; }
      button { padding: 10px 16px; border: 0; border-radius: 999px; background: #2d6cdf; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>{{ title }}</h1>
      <p>当前学习人数：{{ learnerCount }}</p>
      <button type="button" @click="increaseLearner">加入学习</button>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@3/dist/vue.global.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/08-vue3/01-create-app-and-ref/starter.js
+++ b/08-vue3/01-create-app-and-ref/starter.js
@@ -0,0 +1,20 @@
 const { createApp, ref } = Vue;
 createApp({
  setup() {
    const title = ref("Vue3 基础入门");
    const learnerCount = ref(16);
    function increaseLearner() {
      // 任务：
      // 1. learnerCount 加 1
      // 2. 在控制台输出最新人数
    }
    return {
      title,
      learnerCount,
      increaseLearner,
    };
  },
 }).mount("#app");
--- a/08-vue3/02-reactive-and-computed/README.md
+++ b/08-vue3/02-reactive-and-computed/README.md
@@ -0,0 +1,23 @@
 # 练习 2：reactive 和 computed
 ## 目标
 学会把一组相关数据放进 `reactive`，并用 `computed` 推导派生结果。
 ## 你要练什么
 - `reactive`
 - `computed`
 - 响应式对象
 - 派生状态
 ## 任务
 - 用 `reactive` 管理课程信息
 - 用 `computed` 计算进度文案
 - 点击按钮后让完成课时增加
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/02-reactive-and-computed/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/02-reactive-and-computed/starter.js)
--- a/08-vue3/02-reactive-and-computed/starter.html
+++ b/08-vue3/02-reactive-and-computed/starter.html
@@ -0,0 +1,25 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>reactive 和 computed</title>
    <style>
      body { margin: 0; padding: 32px; font-family: "PingFang SC", sans-serif; background: #f6f8fc; }
      .panel { max-width: 720px; margin: 0 auto; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid #dbe4f1; }
      button { padding: 10px 16px; border: 0; border-radius: 999px; background: #1c2f52; color: #fff; cursor: pointer; }
    </style>
  </head>
  <body>
    <section id="app" class="panel">
      <h1>{{ course.title }}</h1>
      <p>总课时：{{ course.totalLessons }}</p>
      <p>已完成：{{ course.finishedLessons }}</p>
      <p>{{ progressText }}</p>
      <button type="button" @click="finishOneLesson">完成一节</button>
    </section>
    <script src="https://cdn.jsdelivr.net/npm/vue@3/dist/vue.global.js"></script>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
rou	2a65ba8c6a	vue2	2026-03-26 21:45:32 +08:00
rou	7c0cbe1320	Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example	2026-03-25 18:13:41 +08:00
rou	acb1445575	l	2026-03-25 18:13:35 +08:00
charlie	3850ce7399	Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example	2026-03-24 23:02:59 +08:00
charlie	d0d8be443b	feat: Add Vue3 exercises and interview plan - Introduced Vue3 exercises covering composable API, reactivity, lifecycle hooks, and built-in components. - Added structured interview plan for frontend candidates focusing on HTML, CSS, JavaScript, TypeScript, and Vue. - Included starter files for each exercise and detailed README documentation for guidance.	2026-03-24 23:02:58 +08:00
rou	d5ff59ac76	update	2026-03-23 16:33:09 +08:00
rou	8b83f63235	Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example	2026-03-23 14:56:21 +08:00
rou	1071f4db05	update	2026-03-23 14:56:04 +08:00
charlie	3435848495	feat: add Vue2 exercises for dynamic styles, lifecycle methods, component communication, and course management dashboard - Implement dynamic styles and event handling in Vue2 with a card component. - Create lifecycle methods exercise to simulate async data loading and instance destruction. - Develop a component communication exercise with props, events, and slots. - Build a comprehensive course management dashboard with filtering, statistics, and component interactions.	2026-03-23 10:09:29 +08:00
rou	00d3c9e4c6	Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example	2026-03-19 15:19:54 +08:00
rou	3afbee1535	JS1	2026-03-19 15:17:29 +08:00