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
252 changed files with 10080 additions and 29 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1 @@
 node_modules
--- a/02-css-layout/10-fixed-and-sticky/answer.css
+++ b/02-css-layout/10-fixed-and-sticky/answer.css
@@ -27,6 +27,7 @@ body {
  background: #ffffff;
  border-bottom: 1px solid #cbd5e1;
  font-weight: 700;
  width: 100%;
 }
 .content {
--- a/02-css-layout/10-fixed-and-sticky/starter.html
+++ b/02-css-layout/10-fixed-and-sticky/starter.html
@@ -7,8 +7,10 @@
    <style>
      body{
        background-color: rgb(248, 252, 255);
        margin: 0px;
        display: flex;
        justify-content: center;
        align-items: center;
      }
      a{
@@ -24,7 +26,23 @@
      }
      .page{
-        wi
+        width: min(700px,calc(100% - 40px));
        margin: 0 auto;
      }
      .topbar{
        padding: 15px;
        background-color: white;
        position: fixed;
        top: 0px;
        font-weight: 700;
        font-size: 17px;
        width: min(700px,calc(100% - 40px));
      }
      .content{
          height: 1100px;
          margin-top: 60px;
      }
    </style>
  </head>
--- a/02-css-layout/11-centering-lab/starter.html
+++ b/02-css-layout/11-centering-lab/starter.html
@@ -1,14 +1,56 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
-  <head>
+
 <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>居中专题</title>
-    <link rel="stylesheet" href="./starter.css" />
+  <style>
-  </head>
+    html {
-  <body>
+      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;
      padding: 15px 20px;
      box-shadow: 0 0 10px rgb(243, 218, 172);
      width: 150px;
      height: 70px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .box {
      text-align: center;
      margin: auto;
    }
  </style>
 </head>
 <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>
+</body>
 </html>
--- 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/README.md
+++ b/04-dom-events-async/01-query-selectors/README.md
@@ -0,0 +1,28 @@
 # 练习 1：获取元素
 ## 目标
 学会用几种常见方式拿到页面元素。
 ## 你要练什么
 - `getElementById`
 - `querySelector`
 - `querySelectorAll`
 - 元素文本读取
 ## 任务
 请基于页面结构完成以下操作：
 - 选中主标题
 - 选中“开始学习”按钮
 - 选中全部学习卡片
 - 在控制台输出标题文字、按钮文字和卡片数量
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/01-query-selectors/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/01-query-selectors/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/01-query-selectors/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/01-query-selectors/answer.js)
--- a/04-dom-events-async/01-query-selectors/answer.html
+++ b/04-dom-events-async/01-query-selectors/answer.html
@@ -0,0 +1,52 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>获取元素</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe3f0;
      }
      .cards {
        display: grid;
        gap: 12px;
        margin-top: 18px;
      }
      .card {
        padding: 16px;
        border-radius: 14px;
        background: #f8fbff;
        border: 1px solid #dce8f8;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1 id="page-title">DOM 获取元素练习</h1>
      <button class="start-btn" type="button">开始学习</button>
      <div class="cards">
        <article class="card">获取标题</article>
        <article class="card">获取按钮</article>
        <article class="card">获取一组卡片</article>
      </div>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/01-query-selectors/answer.js
+++ b/04-dom-events-async/01-query-selectors/answer.js
@@ -0,0 +1,7 @@
 const title = document.getElementById("page-title");
 const button = document.querySelector(".start-btn");
 const cards = document.querySelectorAll(".card");
 console.log("标题：", title.textContent);
 console.log("按钮：", button.textContent);
 console.log("卡片数量：", cards.length);
--- a/04-dom-events-async/01-query-selectors/starter.html
+++ b/04-dom-events-async/01-query-selectors/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>获取元素</title>
  <style>
    body {
      margin: 0;
      padding: 32px;
      font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
      background: #f6f8fb;
    }
    .panel {
      max-width: 760px;
      margin: 0 auto;
      padding: 24px;
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid #dbe3f0;
    }
    .cards {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }
    .card {
      padding: 16px;
      border-radius: 14px;
      background: #f8fbff;
      border: 1px solid #dce8f8;
    }
  </style>
 </head>
 <body>
  <section class="panel">
    <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">
      <article class="card">获取标题</article>
      <article class="card">获取按钮</article>
      <article class="card">获取一组卡片</article>
    </div>
  </section>
  <script src="./starter.js"></script>
 </body>
 </html>
--- a/04-dom-events-async/01-query-selectors/starter.js
+++ b/04-dom-events-async/01-query-selectors/starter.js
@@ -0,0 +1,13 @@
 // 任务：
 // 1. 用 getElementById 获取标题
 // 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/README.md
+++ b/04-dom-events-async/02-text-class-style/README.md
@@ -0,0 +1,25 @@
 # 练习 2：修改文本、类名和样式
 ## 目标
 学会改元素内容、切换类名和设置简单样式。
 ## 你要练什么
 - `textContent`
 - `classList.add`
 - `classList.remove`
 - `style`
 ## 任务
 - 把标题改成“今天已完成 DOM 练习”
 - 给状态标签加上完成样式
 - 修改说明文字颜色
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/02-text-class-style/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/02-text-class-style/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/02-text-class-style/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/02-text-class-style/answer.js)
--- a/04-dom-events-async/02-text-class-style/answer.html
+++ b/04-dom-events-async/02-text-class-style/answer.html
@@ -0,0 +1,47 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>修改文本、类名和样式</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f3f6fb;
      }
      .card {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #d9e3f2;
      }
      .badge {
        display: inline-block;
        padding: 6px 12px;
        border-radius: 999px;
        background: #eef2f7;
        color: #4b5563;
      }
      .badge.done {
        background: #dcfce7;
        color: #166534;
      }
    </style>
  </head>
  <body>
    <section class="card">
      <h1 id="title">今天的学习状态</h1>
      <p id="description">当前还没有更新进度。</p>
      <span id="badge" class="badge">进行中</span>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/02-text-class-style/answer.js
+++ b/04-dom-events-async/02-text-class-style/answer.js
@@ -0,0 +1,9 @@
 const title = document.getElementById("title");
 const description = document.getElementById("description");
 const badge = document.getElementById("badge");
 title.textContent = "今天已完成 DOM 练习";
 description.textContent = "已经练习了元素选择、文本修改和样式切换。";
 description.style.color = "#2563eb";
 badge.textContent = "已完成";
 badge.classList.add("done");
--- a/04-dom-events-async/02-text-class-style/starter.html
+++ b/04-dom-events-async/02-text-class-style/starter.html
@@ -0,0 +1,47 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>修改文本、类名和样式</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f3f6fb;
      }
      .card {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #d9e3f2;
      }
      .badge {
        display: inline-block;
        padding: 6px 12px;
        border-radius: 999px;
        background: #eef2f7;
        color: #4b5563;
      }
      .badge.done {
        background: #dcfce7;
        color: #166534;
      }
    </style>
  </head>
  <body>
    <section class="card">
      <h1 id="title">今天的学习状态</h1>
      <p id="description">当前还没有更新进度。</p>
      <span id="badge" class="badge">进行中</span>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/02-text-class-style/starter.js
+++ b/04-dom-events-async/02-text-class-style/starter.js
@@ -0,0 +1,11 @@
 // 任务：
 // 1. 选中标题、描述、状态标签
 // 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/README.md
+++ b/04-dom-events-async/03-create-and-remove/README.md
@@ -0,0 +1,24 @@
 # 练习 3：创建和删除节点
 ## 目标
 学会动态新增和删除页面节点。
 ## 你要练什么
 - `createElement`
 - `appendChild`
 - `remove`
 - 事件绑定
 ## 任务
 - 点击“新增任务”时往列表里加一个新项
 - 点击“删除最后一项”时删除最后一个列表项
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/03-create-and-remove/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/03-create-and-remove/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/03-create-and-remove/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/03-create-and-remove/answer.js)
--- a/04-dom-events-async/03-create-and-remove/answer.html
+++ b/04-dom-events-async/03-create-and-remove/answer.html
@@ -0,0 +1,47 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>创建和删除节点</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      ul {
        padding-left: 20px;
      }
      button {
        margin-right: 10px;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>任务列表</h1>
      <button id="add-btn" type="button">新增任务</button>
      <button id="remove-btn" type="button">删除最后一项</button>
      <ul id="task-list">
        <li>学习 querySelector</li>
        <li>学习 classList</li>
      </ul>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/03-create-and-remove/answer.js
+++ b/04-dom-events-async/03-create-and-remove/answer.js
@@ -0,0 +1,20 @@
 const addButton = document.getElementById("add-btn");
 const removeButton = document.getElementById("remove-btn");
 const taskList = document.getElementById("task-list");
 let taskIndex = 3;
 addButton.addEventListener("click", function () {
  const item = document.createElement("li");
  item.textContent = `新任务 ${taskIndex}`;
  taskList.appendChild(item);
  taskIndex += 1;
 });
 removeButton.addEventListener("click", function () {
  const lastItem = taskList.lastElementChild;
  if (lastItem) {
    lastItem.remove();
  }
 });
--- a/04-dom-events-async/03-create-and-remove/starter.html
+++ b/04-dom-events-async/03-create-and-remove/starter.html
@@ -0,0 +1,47 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>创建和删除节点</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      ul {
        padding-left: 20px;
      }
      button {
        margin-right: 10px;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>任务列表</h1>
      <button id="add-btn" type="button">新增任务</button>
      <button id="remove-btn" type="button">删除最后一项</button>
      <ul id="task-list">
        <li>学习 querySelector</li>
        <li>学习 classList</li>
      </ul>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/03-create-and-remove/starter.js
+++ b/04-dom-events-async/03-create-and-remove/starter.js
@@ -0,0 +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/README.md
+++ b/04-dom-events-async/04-click-counter/README.md
@@ -0,0 +1,25 @@
 # 练习 4：点击计数器
 ## 目标
 学会给按钮绑定点击事件，并更新页面数据。
 ## 你要练什么
 - `addEventListener`
 - 点击事件
 - 数字状态更新
 - DOM 渲染
 ## 任务
 - 点击加一按钮时计数加 1
 - 点击减一按钮时计数减 1
 - 点击重置按钮时恢复为 0
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/answer.js)
--- a/04-dom-events-async/04-click-counter/answer.html
+++ b/04-dom-events-async/04-click-counter/answer.html
@@ -0,0 +1,51 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>点击计数器</title>
    <style>
      body {
        margin: 0;
        min-height: 100vh;
        display: grid;
        place-items: center;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f4f7fb;
      }
      .counter {
        width: 320px;
        padding: 24px;
        text-align: center;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe3ef;
      }
      #value {
        font-size: 48px;
        font-weight: 800;
      }
      .actions {
        display: flex;
        justify-content: center;
        gap: 10px;
      }
    </style>
  </head>
  <body>
    <section class="counter">
      <h1>点击计数器</h1>
      <p id="value">0</p>
      <div class="actions">
        <button id="decrease-btn" type="button">-1</button>
        <button id="increase-btn" type="button">+1</button>
        <button id="reset-btn" type="button">重置</button>
      </div>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/04-click-counter/answer.js
+++ b/04-dom-events-async/04-click-counter/answer.js
@@ -0,0 +1,25 @@
 let count = 0;
 const value = document.getElementById("value");
 const decreaseButton = document.getElementById("decrease-btn");
 const increaseButton = document.getElementById("increase-btn");
 const resetButton = document.getElementById("reset-btn");
 function render() {
  value.textContent = count;
 }
 decreaseButton.addEventListener("click", function () {
  count -= 1;
  render();
 });
 increaseButton.addEventListener("click", function () {
  count += 1;
  render();
 });
 resetButton.addEventListener("click", function () {
  count = 0;
  render();
 });
--- a/04-dom-events-async/04-click-counter/starter.html
+++ b/04-dom-events-async/04-click-counter/starter.html
@@ -0,0 +1,51 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>点击计数器</title>
    <style>
      body {
        margin: 0;
        min-height: 100vh;
        display: grid;
        place-items: center;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f4f7fb;
      }
      .counter {
        width: 320px;
        padding: 24px;
        text-align: center;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe3ef;
      }
      #value {
        font-size: 48px;
        font-weight: 800;
      }
      .actions {
        display: flex;
        justify-content: center;
        gap: 10px;
      }
    </style>
  </head>
  <body>
    <section class="counter">
      <h1>点击计数器</h1>
      <p id="value">0</p>
      <div class="actions">
        <button id="decrease-btn" type="button">-1</button>
        <button id="increase-btn" type="button">+1</button>
        <button id="reset-btn" type="button">重置</button>
      </div>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/04-click-counter/starter.js
+++ b/04-dom-events-async/04-click-counter/starter.js
@@ -0,0 +1,29 @@
 let count = 0;
 // 任务：
 // 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/README.md
+++ b/04-dom-events-async/05-form-submit-and-prevent-default/README.md
@@ -0,0 +1,26 @@
 # 练习 5：表单提交和 preventDefault
 ## 目标
 学会拦截表单默认提交，并把输入内容渲染到页面。
 ## 你要练什么
 - `submit` 事件
 - `preventDefault()`
 - 表单值读取
 - 动态追加列表项
 ## 任务
 - 提交表单时阻止页面刷新
 - 读取输入框内容
 - 把内容加入到待办列表
 - 提交后清空输入框
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/05-form-submit-and-prevent-default/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/05-form-submit-and-prevent-default/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/05-form-submit-and-prevent-default/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/05-form-submit-and-prevent-default/answer.js)
--- a/04-dom-events-async/05-form-submit-and-prevent-default/answer.html
+++ b/04-dom-events-async/05-form-submit-and-prevent-default/answer.html
@@ -0,0 +1,51 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>表单提交和 preventDefault</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      form {
        display: flex;
        gap: 10px;
      }
      input {
        flex: 1;
        padding: 10px 12px;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>学习待办</h1>
      <form id="todo-form">
        <input id="todo-input" type="text" placeholder="输入今天要学的内容" />
        <button type="submit">添加</button>
      </form>
      <ul id="todo-list">
        <li>完成 DOM 选择练习</li>
      </ul>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/05-form-submit-and-prevent-default/answer.js
+++ b/04-dom-events-async/05-form-submit-and-prevent-default/answer.js
@@ -0,0 +1,18 @@
 const form = document.getElementById("todo-form");
 const input = document.getElementById("todo-input");
 const list = document.getElementById("todo-list");
 form.addEventListener("submit", function (event) {
  event.preventDefault();
  const value = input.value.trim();
  if (!value) {
    return;
  }
  const item = document.createElement("li");
  item.textContent = value;
  list.appendChild(item);
  input.value = "";
 });
--- a/04-dom-events-async/05-form-submit-and-prevent-default/starter.html
+++ b/04-dom-events-async/05-form-submit-and-prevent-default/starter.html
@@ -0,0 +1,51 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>表单提交和 preventDefault</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      form {
        display: flex;
        gap: 10px;
      }
      input {
        flex: 1;
        padding: 10px 12px;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>学习待办</h1>
      <form id="todo-form">
        <input id="todo-input" type="text" placeholder="输入今天要学的内容" />
        <button type="submit">添加</button>
      </form>
      <ul id="todo-list">
        <li>完成 DOM 选择练习</li>
      </ul>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- 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
@@ -0,0 +1,20 @@
 // 任务：
 // 1. 获取表单、输入框和列表
 // 2. 监听 submit 事件
 // 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/README.md
+++ b/04-dom-events-async/06-bubbling-and-delegation/README.md
@@ -0,0 +1,25 @@
 # 练习 6：冒泡、委托和 stopPropagation
 ## 目标
 理解事件会冒泡，并学会在列表里使用事件委托。
 ## 你要练什么
 - 事件冒泡
 - `event.target`
 - 事件委托
 - `stopPropagation()`
 ## 任务
 - 点击外层面板时输出一条日志
 - 点击列表项时，通过事件委托切换激活状态
 - 点击列表项里的删除按钮时，阻止冒泡并删除当前项
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/answer.js)
--- a/04-dom-events-async/06-bubbling-and-delegation/answer.html
+++ b/04-dom-events-async/06-bubbling-and-delegation/answer.html
@@ -0,0 +1,58 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>冒泡、委托和 stopPropagation</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe2ee;
      }
      .lesson-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 12px 14px;
        border: 1px solid #dbe2ee;
        border-radius: 12px;
        margin-top: 10px;
      }
      .lesson-item.active {
        background: #dbeafe;
      }
    </style>
  </head>
  <body>
    <section id="panel" class="panel">
      <h1>事件委托练习</h1>
      <p>点击列表项可以切换高亮，点击删除按钮可以移除当前项。</p>
      <ul id="lesson-list">
        <li class="lesson-item">
          <span>事件冒泡</span>
          <button class="remove-btn" type="button">删除</button>
        </li>
        <li class="lesson-item">
          <span>事件委托</span>
          <button class="remove-btn" type="button">删除</button>
        </li>
      </ul>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/06-bubbling-and-delegation/answer.js
+++ b/04-dom-events-async/06-bubbling-and-delegation/answer.js
@@ -0,0 +1,27 @@
 const panel = document.getElementById("panel");
 const lessonList = document.getElementById("lesson-list");
 panel.addEventListener("click", function () {
  console.log("点击到了外层面板");
 });
 lessonList.addEventListener("click", function (event) {
  const removeButton = event.target.closest(".remove-btn");
  if (removeButton) {
    event.stopPropagation();
    const currentItem = removeButton.closest(".lesson-item");
    if (currentItem) {
      currentItem.remove();
    }
    return;
  }
  const currentItem = event.target.closest(".lesson-item");
  if (currentItem) {
    currentItem.classList.toggle("active");
  }
 });
--- a/04-dom-events-async/06-bubbling-and-delegation/starter.html
+++ b/04-dom-events-async/06-bubbling-and-delegation/starter.html
@@ -0,0 +1,58 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>冒泡、委托和 stopPropagation</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe2ee;
      }
      .lesson-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 12px 14px;
        border: 1px solid #dbe2ee;
        border-radius: 12px;
        margin-top: 10px;
      }
      .lesson-item.active {
        background: #dbeafe;
      }
    </style>
  </head>
  <body>
    <section id="panel" class="panel">
      <h1>事件委托练习</h1>
      <p>点击列表项可以切换高亮，点击删除按钮可以移除当前项。</p>
      <ul id="lesson-list">
        <li class="lesson-item">
          <span>事件冒泡</span>
          <button class="remove-btn" type="button">删除</button>
        </li>
        <li class="lesson-item">
          <span>事件委托</span>
          <button class="remove-btn" type="button">删除</button>
        </li>
      </ul>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/06-bubbling-and-delegation/starter.js
+++ b/04-dom-events-async/06-bubbling-and-delegation/starter.js
@@ -0,0 +1,30 @@
 // 任务：
 // 1. 给 panel 绑定点击事件，输出一条日志
 // 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/README.md
+++ b/04-dom-events-async/07-timers-and-async-order/README.md
@@ -0,0 +1,25 @@
 # 练习 7：setTimeout 和异步顺序
 ## 目标
 理解同步代码和异步回调的执行先后顺序。
 ## 你要练什么
 - `setTimeout`
 - 同步顺序
 - 异步回调
 - DOM 日志输出
 ## 任务
 - 点击按钮后先输出“开始执行”
 - 再立刻输出“同步代码结束”
 - 然后延迟输出“异步回调完成”
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/answer.js)
--- a/04-dom-events-async/07-timers-and-async-order/answer.html
+++ b/04-dom-events-async/07-timers-and-async-order/answer.html
@@ -0,0 +1,38 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>setTimeout 和异步顺序</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .panel {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      #log-list li {
        margin-top: 8px;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>异步顺序练习</h1>
      <button id="run-btn" type="button">开始执行</button>
      <ul id="log-list"></ul>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/07-timers-and-async-order/answer.js
+++ b/04-dom-events-async/07-timers-and-async-order/answer.js
@@ -0,0 +1,20 @@
 const runButton = document.getElementById("run-btn");
 const logList = document.getElementById("log-list");
 function appendLog(text) {
  const item = document.createElement("li");
  item.textContent = text;
  logList.appendChild(item);
 }
 runButton.addEventListener("click", function () {
  logList.innerHTML = "";
  appendLog("开始执行");
  setTimeout(function () {
    appendLog("异步回调完成");
  }, 600);
  appendLog("同步代码结束");
 });
--- a/04-dom-events-async/07-timers-and-async-order/starter.html
+++ b/04-dom-events-async/07-timers-and-async-order/starter.html
@@ -0,0 +1,38 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>setTimeout 和异步顺序</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .panel {
        max-width: 720px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      #log-list li {
        margin-top: 8px;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>异步顺序练习</h1>
      <button id="run-btn" type="button">开始执行</button>
      <ul id="log-list"></ul>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/07-timers-and-async-order/starter.js
+++ b/04-dom-events-async/07-timers-and-async-order/starter.js
@@ -0,0 +1,26 @@
 // 任务：
 // 1. 获取按钮和日志列表
 // 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/README.md
+++ b/04-dom-events-async/08-promise-and-render/README.md
@@ -0,0 +1,26 @@
 # 练习 8：Promise 和渲染
 ## 目标
 学会在 Promise 完成后把结果渲染到页面。
 ## 你要练什么
 - Promise
 - `.then()`
 - `catch()`
 - loading 状态
 ## 任务
 - 点击按钮后显示“加载中”
 - 等待 Promise 返回数据
 - 把课程名称渲染到列表
 - 如果失败，显示错误信息
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/08-promise-and-render/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/08-promise-and-render/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/08-promise-and-render/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/08-promise-and-render/answer.js)
--- a/04-dom-events-async/08-promise-and-render/answer.html
+++ b/04-dom-events-async/08-promise-and-render/answer.html
@@ -0,0 +1,35 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Promise 和渲染</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f4f7fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce3ef;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>Promise 数据渲染</h1>
      <button id="load-btn" type="button">加载课程</button>
      <p id="status-text">等待加载</p>
      <ul id="course-list"></ul>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/08-promise-and-render/answer.js
+++ b/04-dom-events-async/08-promise-and-render/answer.js
@@ -0,0 +1,30 @@
 function fakeFetchCourses() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      resolve(["DOM 获取元素", "事件监听", "异步基础"]);
    }, 800);
  });
 }
 const loadButton = document.getElementById("load-btn");
 const statusText = document.getElementById("status-text");
 const courseList = document.getElementById("course-list");
 loadButton.addEventListener("click", function () {
  statusText.textContent = "加载中...";
  courseList.innerHTML = "";
  fakeFetchCourses()
    .then(function (courses) {
      courses.forEach(function (course) {
        const item = document.createElement("li");
        item.textContent = course;
        courseList.appendChild(item);
      });
      statusText.textContent = "加载完成";
    })
    .catch(function () {
      statusText.textContent = "加载失败";
    });
 });
--- a/04-dom-events-async/08-promise-and-render/starter.html
+++ b/04-dom-events-async/08-promise-and-render/starter.html
@@ -0,0 +1,35 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Promise 和渲染</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f4f7fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce3ef;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>Promise 数据渲染</h1>
      <button id="load-btn" type="button">加载课程</button>
      <p id="status-text">等待加载</p>
      <ul id="course-list"></ul>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/08-promise-and-render/starter.js
+++ b/04-dom-events-async/08-promise-and-render/starter.js
@@ -0,0 +1,34 @@
 function fakeFetchCourses() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      resolve(["DOM 获取元素", "事件监听", "异步基础"]);
    }, 800);
  });
 }
 // 任务：
 // 1. 获取按钮、状态文字、列表
 // 2. 点击按钮后显示“加载中”
 // 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/README.md
+++ b/04-dom-events-async/09-async-await-panel/README.md
@@ -0,0 +1,26 @@
 # 练习 9：async / await 面板
 ## 目标
 学会用 `async` / `await` 写一个更直观的异步流程。
 ## 你要练什么
 - `async`
 - `await`
 - `try...catch`
 - DOM 更新
 ## 任务
 - 点击按钮后进入加载状态
 - 等待异步函数返回用户信息
 - 把结果渲染到卡片里
 - 如果失败，显示错误信息
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/09-async-await-panel/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/09-async-await-panel/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/09-async-await-panel/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/09-async-await-panel/answer.js)
--- a/04-dom-events-async/09-async-await-panel/answer.html
+++ b/04-dom-events-async/09-async-await-panel/answer.html
@@ -0,0 +1,35 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>async / await 面板</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dbe4ef;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>用户信息面板</h1>
      <button id="load-user-btn" type="button">加载用户信息</button>
      <p id="user-status">等待加载</p>
      <div id="user-card"></div>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/09-async-await-panel/answer.js
+++ b/04-dom-events-async/09-async-await-panel/answer.js
@@ -0,0 +1,35 @@
 function fakeFetchUser() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      resolve({
        name: "林晨",
        role: "前端学习者",
        focus: "DOM + 事件 + 异步",
      });
    }, 900);
  });
 }
 const loadButton = document.getElementById("load-user-btn");
 const statusText = document.getElementById("user-status");
 const userCard = document.getElementById("user-card");
 async function loadUser() {
  statusText.textContent = "加载中...";
  userCard.innerHTML = "";
  try {
    const user = await fakeFetchUser();
    userCard.innerHTML = `
      <p>姓名：${user.name}</p>
      <p>身份：${user.role}</p>
      <p>当前重点：${user.focus}</p>
    `;
    statusText.textContent = "加载完成";
  } catch (error) {
    statusText.textContent = "加载失败";
  }
 }
 loadButton.addEventListener("click", loadUser);
--- a/04-dom-events-async/09-async-await-panel/starter.html
+++ b/04-dom-events-async/09-async-await-panel/starter.html
@@ -0,0 +1,35 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>async / await 面板</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dbe4ef;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>用户信息面板</h1>
      <button id="load-user-btn" type="button">加载用户信息</button>
      <p id="user-status">等待加载</p>
      <div id="user-card"></div>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/09-async-await-panel/starter.js
+++ b/04-dom-events-async/09-async-await-panel/starter.js
@@ -0,0 +1,39 @@
 function fakeFetchUser() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      resolve({
        name: "林晨",
        role: "前端学习者",
        focus: "DOM + 事件 + 异步",
      });
    }, 900);
  });
 }
 // 任务：
 // 1. 获取按钮、状态文字、信息面板
 // 2. 写一个 async 函数
 // 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/README.md
+++ b/04-dom-events-async/10-final-dashboard/README.md
@@ -0,0 +1,34 @@
 # 练习 10：综合页面
 ## 目标
 把 DOM、事件和异步知识拼起来，做一个可以真实互动的小页面。
 ## 项目名称
 学习面板
 ## 任务
 请完成一个控制台之外可见的页面交互，要求至少包含：
 - 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
 ## 建议顺序
 1. 先看 HTML 结构
 2. 先写元素获取和渲染函数
 3. 再写表单提交和点击事件
 4. 最后补异步加载逻辑
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/10-final-dashboard/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/10-final-dashboard/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/10-final-dashboard/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/10-final-dashboard/answer.js)
--- a/04-dom-events-async/10-final-dashboard/answer.html
+++ b/04-dom-events-async/10-final-dashboard/answer.html
@@ -0,0 +1,82 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>学习面板</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: linear-gradient(180deg, #eef4ff 0%, #f7faff 100%);
        color: #0f172a;
      }
      .page {
        width: min(900px, calc(100% - 24px));
        margin: 0 auto;
      }
      .hero,
      .panel,
      .form-panel {
        margin-top: 18px;
        padding: 24px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe4f0;
      }
      .lesson-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 10px;
        padding: 12px 14px;
        border-radius: 12px;
        background: #f8fbff;
        border: 1px solid #dbe4f0;
      }
      .lesson-item.done {
        background: #dcfce7;
        border-color: #bbf7d0;
      }
      form {
        display: flex;
        gap: 10px;
      }
      input {
        flex: 1;
        padding: 10px 12px;
      }
    </style>
  </head>
  <body>
    <main class="page">
      <section class="hero">
        <h1>DOM + 事件 + 异步学习面板</h1>
        <p id="status-text">正在初始化页面...</p>
      </section>
      <section class="panel">
        <h2>课程列表</h2>
        <button id="load-btn" type="button">模拟加载课程</button>
        <ul id="lesson-list"></ul>
      </section>
      <section class="form-panel">
        <h2>添加课程</h2>
        <form id="lesson-form">
          <input id="lesson-input" type="text" placeholder="输入课程名称" />
          <button type="submit">添加</button>
        </form>
      </section>
    </main>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/10-final-dashboard/answer.js
+++ b/04-dom-events-async/10-final-dashboard/answer.js
@@ -0,0 +1,84 @@
 const lessons = [
  { title: "获取元素", done: false },
  { title: "修改 DOM", done: true },
 ];
 function fakeLoadExtraLessons() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      resolve([
        { title: "事件委托", done: false },
        { title: "异步渲染", done: false },
      ]);
    }, 900);
  });
 }
 const statusText = document.getElementById("status-text");
 const loadButton = document.getElementById("load-btn");
 const lessonList = document.getElementById("lesson-list");
 const lessonForm = document.getElementById("lesson-form");
 const lessonInput = document.getElementById("lesson-input");
 function renderLessons() {
  lessonList.innerHTML = "";
  lessons.forEach(function (lesson, index) {
    const item = document.createElement("li");
    item.className = "lesson-item";
    if (lesson.done) {
      item.classList.add("done");
    }
    item.dataset.index = index;
    item.textContent = lesson.title;
    lessonList.appendChild(item);
  });
 }
 lessonList.addEventListener("click", function (event) {
  const currentItem = event.target.closest(".lesson-item");
  if (!currentItem) {
    return;
  }
  const index = Number(currentItem.dataset.index);
  lessons[index].done = !lessons[index].done;
  renderLessons();
 });
 lessonForm.addEventListener("submit", function (event) {
  event.preventDefault();
  const value = lessonInput.value.trim();
  if (!value) {
    return;
  }
  lessons.push({
    title: value,
    done: false,
  });
  lessonInput.value = "";
  statusText.textContent = "已新增一门课程";
  renderLessons();
 });
 loadButton.addEventListener("click", async function () {
  statusText.textContent = "正在异步加载课程...";
  const newLessons = await fakeLoadExtraLessons();
  newLessons.forEach(function (lesson) {
    lessons.push(lesson);
  });
  statusText.textContent = "额外课程加载完成";
  renderLessons();
 });
 statusText.textContent = "页面初始化完成";
 renderLessons();
--- a/04-dom-events-async/10-final-dashboard/starter.html
+++ b/04-dom-events-async/10-final-dashboard/starter.html
@@ -0,0 +1,82 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>学习面板</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: linear-gradient(180deg, #eef4ff 0%, #f7faff 100%);
        color: #0f172a;
      }
      .page {
        width: min(900px, calc(100% - 24px));
        margin: 0 auto;
      }
      .hero,
      .panel,
      .form-panel {
        margin-top: 18px;
        padding: 24px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid #dbe4f0;
      }
      .lesson-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 10px;
        padding: 12px 14px;
        border-radius: 12px;
        background: #f8fbff;
        border: 1px solid #dbe4f0;
      }
      .lesson-item.done {
        background: #dcfce7;
        border-color: #bbf7d0;
      }
      form {
        display: flex;
        gap: 10px;
      }
      input {
        flex: 1;
        padding: 10px 12px;
      }
    </style>
  </head>
  <body>
    <main class="page">
      <section class="hero">
        <h1>DOM + 事件 + 异步学习面板</h1>
        <p id="status-text">正在初始化页面...</p>
      </section>
      <section class="panel">
        <h2>课程列表</h2>
        <button id="load-btn" type="button">模拟加载课程</button>
        <ul id="lesson-list"></ul>
      </section>
      <section class="form-panel">
        <h2>添加课程</h2>
        <form id="lesson-form">
          <input id="lesson-input" type="text" placeholder="输入课程名称" />
          <button type="submit">添加</button>
        </form>
      </section>
    </main>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/10-final-dashboard/starter.js
+++ b/04-dom-events-async/10-final-dashboard/starter.js
@@ -0,0 +1,104 @@
 const lessons = [
  { title: "获取元素", done: false },
  { title: "修改 DOM", done: true },
 ];
 function fakeLoadExtraLessons() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      resolve([
        { title: "事件委托", done: false },
        { title: "异步渲染", done: false },
      ]);
    }, 900);
  });
 }
 // 任务：
 // 1. 获取页面里的关键元素
 // 2. 写一个 renderLessons 函数，把 lessons 渲染到列表
 // 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/README.md
+++ b/04-dom-events-async/11-input-live-preview/README.md
@@ -0,0 +1,25 @@
 # 练习 11：input 实时预览
 ## 目标
 学会处理输入类事件，让页面随着用户输入实时变化。
 ## 你要练什么
 - `input` 事件
 - `change` 事件
 - 表单值读取
 - 实时 DOM 更新
 ## 任务
 - 在输入框输入昵称时，实时更新预览标题
 - 在文本域输入学习目标时，实时更新预览内容
 - 切换学习阶段下拉框时，更新阶段标签
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/answer.js)
--- a/04-dom-events-async/11-input-live-preview/answer.html
+++ b/04-dom-events-async/11-input-live-preview/answer.html
@@ -0,0 +1,86 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>input 实时预览</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .page {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 18px;
        max-width: 960px;
        margin: 0 auto;
      }
      .panel {
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      label {
        display: grid;
        gap: 8px;
        margin-top: 12px;
      }
      input,
      textarea,
      select {
        padding: 10px 12px;
        font: inherit;
      }
      .badge {
        display: inline-block;
        padding: 6px 12px;
        border-radius: 999px;
        background: #dbeafe;
        color: #1d4ed8;
      }
    </style>
  </head>
  <body>
    <main class="page">
      <section class="panel">
        <h1>编辑资料</h1>
        <label for="nickname-input">
          昵称
          <input id="nickname-input" type="text" placeholder="输入你的昵称" />
        </label>
        <label for="goal-input">
          学习目标
          <textarea id="goal-input" rows="4" placeholder="输入今天的学习目标"></textarea>
        </label>
        <label for="stage-select">
          学习阶段
          <select id="stage-select">
            <option value="入门阶段">入门阶段</option>
            <option value="DOM 阶段">DOM 阶段</option>
            <option value="异步阶段">异步阶段</option>
          </select>
        </label>
      </section>
      <section class="panel">
        <p class="badge" id="preview-stage">入门阶段</p>
        <h2 id="preview-name">未填写昵称</h2>
        <p id="preview-goal">这里会显示你的学习目标。</p>
      </section>
    </main>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/11-input-live-preview/answer.js
+++ b/04-dom-events-async/11-input-live-preview/answer.js
@@ -0,0 +1,21 @@
 const nicknameInput = document.getElementById("nickname-input");
 const goalInput = document.getElementById("goal-input");
 const stageSelect = document.getElementById("stage-select");
 const previewStage = document.getElementById("preview-stage");
 const previewName = document.getElementById("preview-name");
 const previewGoal = document.getElementById("preview-goal");
 nicknameInput.addEventListener("input", function () {
  const value = nicknameInput.value.trim();
  previewName.textContent = value || "未填写昵称";
 });
 goalInput.addEventListener("input", function () {
  const value = goalInput.value.trim();
  previewGoal.textContent = value || "这里会显示你的学习目标。";
 });
 stageSelect.addEventListener("change", function () {
  previewStage.textContent = stageSelect.value;
 });
--- a/04-dom-events-async/11-input-live-preview/starter.html
+++ b/04-dom-events-async/11-input-live-preview/starter.html
@@ -0,0 +1,86 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>input 实时预览</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f6f8fb;
      }
      .page {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 18px;
        max-width: 960px;
        margin: 0 auto;
      }
      .panel {
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      label {
        display: grid;
        gap: 8px;
        margin-top: 12px;
      }
      input,
      textarea,
      select {
        padding: 10px 12px;
        font: inherit;
      }
      .badge {
        display: inline-block;
        padding: 6px 12px;
        border-radius: 999px;
        background: #dbeafe;
        color: #1d4ed8;
      }
    </style>
  </head>
  <body>
    <main class="page">
      <section class="panel">
        <h1>编辑资料</h1>
        <label for="nickname-input">
          昵称
          <input id="nickname-input" type="text" placeholder="输入你的昵称" />
        </label>
        <label for="goal-input">
          学习目标
          <textarea id="goal-input" rows="4" placeholder="输入今天的学习目标"></textarea>
        </label>
        <label for="stage-select">
          学习阶段
          <select id="stage-select">
            <option value="入门阶段">入门阶段</option>
            <option value="DOM 阶段">DOM 阶段</option>
            <option value="异步阶段">异步阶段</option>
          </select>
        </label>
      </section>
      <section class="panel">
        <p class="badge" id="preview-stage">入门阶段</p>
        <h2 id="preview-name">未填写昵称</h2>
        <p id="preview-goal">这里会显示你的学习目标。</p>
      </section>
    </main>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/11-input-live-preview/starter.js
+++ b/04-dom-events-async/11-input-live-preview/starter.js
@@ -0,0 +1,29 @@
 // 任务：
 // 1. 获取昵称输入框、目标文本域、阶段下拉框
 // 2. 监听昵称和目标的 input 事件
 // 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/README.md
+++ b/04-dom-events-async/12-prepend-remove-and-link-default/README.md
@@ -0,0 +1,25 @@
 # 练习 12：prepend、classList.remove 和链接默认行为
 ## 目标
 补齐几个常见但容易漏掉的 DOM 细节操作。
 ## 你要练什么
 - `prepend()`
 - `classList.remove()`
 - 链接点击事件
 - `preventDefault()`
 ## 任务
 - 点击“插入到最前面”时，把一条新消息插入列表顶部
 - 点击“清除高亮”时，移除全部高亮类名
 - 点击帮助链接时，阻止默认跳转，并在页面显示提示信息
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/answer.js)
--- a/04-dom-events-async/12-prepend-remove-and-link-default/answer.html
+++ b/04-dom-events-async/12-prepend-remove-and-link-default/answer.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>prepend、classList.remove 和链接默认行为</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      .item {
        margin-top: 10px;
        padding: 12px 14px;
        border-radius: 12px;
        border: 1px solid #dbe4f0;
      }
      .item.active {
        background: #dbeafe;
      }
      .actions {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>补漏练习</h1>
      <div class="actions">
        <button id="prepend-btn" type="button">插入到最前面</button>
        <button id="clear-active-btn" type="button">清除高亮</button>
        <a id="help-link" href="https://example.com/help">查看帮助</a>
      </div>
      <p id="hint-text">这里会显示操作提示。</p>
      <ul id="message-list">
        <li class="item active">先学事件监听</li>
        <li class="item active">再学异步顺序</li>
        <li class="item">最后做综合页面</li>
      </ul>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/04-dom-events-async/12-prepend-remove-and-link-default/answer.js
+++ b/04-dom-events-async/12-prepend-remove-and-link-default/answer.js
@@ -0,0 +1,31 @@
 const prependButton = document.getElementById("prepend-btn");
 const clearActiveButton = document.getElementById("clear-active-btn");
 const helpLink = document.getElementById("help-link");
 const hintText = document.getElementById("hint-text");
 const messageList = document.getElementById("message-list");
 let messageIndex = 1;
 prependButton.addEventListener("click", function () {
  const item = document.createElement("li");
  item.className = "item active";
  item.textContent = `新插入的提醒 ${messageIndex}`;
  messageList.prepend(item);
  hintText.textContent = "已把一条消息插入到最前面";
  messageIndex += 1;
 });
 clearActiveButton.addEventListener("click", function () {
  const items = document.querySelectorAll(".item");
  items.forEach(function (item) {
    item.classList.remove("active");
  });
  hintText.textContent = "已移除全部高亮状态";
 });
 helpLink.addEventListener("click", function (event) {
  event.preventDefault();
  hintText.textContent = "已阻止默认跳转";
 });
--- a/04-dom-events-async/12-prepend-remove-and-link-default/starter.html
+++ b/04-dom-events-async/12-prepend-remove-and-link-default/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>prepend、classList.remove 和链接默认行为</title>
    <style>
      body {
        margin: 0;
        padding: 32px;
        font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
        background: #f5f7fb;
      }
      .panel {
        max-width: 760px;
        margin: 0 auto;
        padding: 24px;
        border-radius: 18px;
        background: #ffffff;
        border: 1px solid #dce4ef;
      }
      .item {
        margin-top: 10px;
        padding: 12px 14px;
        border-radius: 12px;
        border: 1px solid #dbe4f0;
      }
      .item.active {
        background: #dbeafe;
      }
      .actions {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
      }
    </style>
  </head>
  <body>
    <section class="panel">
      <h1>补漏练习</h1>
      <div class="actions">
        <button id="prepend-btn" type="button">插入到最前面</button>
        <button id="clear-active-btn" type="button">清除高亮</button>
        <a id="help-link" href="https://example.com/help">查看帮助</a>
      </div>
      <p id="hint-text">这里会显示操作提示。</p>
      <ul id="message-list">
        <li class="item active">先学事件监听</li>
        <li class="item active">再学异步顺序</li>
        <li class="item">最后做综合页面</li>
      </ul>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- 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
@@ -0,0 +1,29 @@
 // 任务：
 // 1. 获取两个按钮、帮助链接、提示文字和列表
 // 2. 点击 prepend-btn 时创建新 li，并插入到列表最前面
 // 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/04-dom-events-async/README.md
+++ b/04-dom-events-async/README.md
@@ -0,0 +1,176 @@
 # DOM + 事件 + 异步
 这部分只解决一个问题：你能不能让页面里的元素被 JavaScript 真正控制起来，并对用户操作和异步结果做出响应。
 ## 学完后你应该掌握
 - 如何获取页面元素
 - 如何修改文本、样式和类名
 - 如何创建、插入和删除节点
 - 如何监听点击、输入、提交等事件
 - `preventDefault()` 和 `stopPropagation()` 的常见场景
 - 事件委托的基本写法
 - `prepend()`、`classList.remove()` 的基础使用
 - `setTimeout` 的异步顺序
 - Promise 的基础用法
 - `async` / `await` 的基础写法
 - 如何把 DOM、事件、异步组合成一个小页面
 ## 这一章在解决什么
 前面三章分别解决了：
 - 页面有什么结构
 - 页面长什么样
 - 代码逻辑怎么写
 这一章开始，JavaScript 不再只是打印到控制台，而是要真正操作页面。
 它回答的是：
 - 我怎么拿到某个按钮或输入框
 - 用户点击后页面怎么变
 - 表单提交后怎么处理
 - 数据晚一点回来时页面怎么更新
 ## 必须建立的 5 个核心意识
 ### 1. 先选中元素，再操作元素
 DOM 操作第一步不是“改”，而是“找到”。
 常见方式：
 - `getElementById`
 - `querySelector`
 - `querySelectorAll`
 ### 2. 事件是页面和用户的连接点
 页面本身不会“自动响应”。
 是你通过事件监听告诉浏览器：
 - 点了按钮要做什么
 - 输入框变化后要做什么
 - 提交表单要做什么
 ### 3. 改页面就是改 DOM
 常见 DOM 改动包括：
 - 改文字：`textContent`
 - 改类名：`classList`
 - 改样式：`style`
 - 增删节点：`appendChild`、`remove`
 ### 4. 异步不是“慢一点执行”，而是“先不阻塞主流程”
 比如：
 - `setTimeout`
 - Promise
 - `async` / `await`
 这些都意味着：当前代码先继续往下走，结果稍后回来再处理。
 ### 5. 一个完整交互通常是“事件 + DOM + 状态 + 异步”
 例如点击“加载数据”按钮时：
 1. 监听点击事件
 2. 更新 loading 状态
 3. 等待异步结果
 4. 把结果渲染到页面
 ## 高频 API 速记
 ### 获取元素
 - `document.getElementById()`
 - `document.querySelector()`
 - `document.querySelectorAll()`
 ### 修改元素
 - `textContent`
 - `innerHTML`
 - `style`
 - `classList.add()`
 - `classList.remove()`
 - `classList.toggle()`
 ### 节点操作
 - `document.createElement()`
 - `appendChild()`
 - `prepend()`
 - `remove()`
 ### 事件
 - `addEventListener()`
 - `event.target`
 - `preventDefault()`
 - `stopPropagation()`
 ### 异步
 - `setTimeout()`
 - `Promise`
 - `.then()`
 - `async`
 - `await`
 ## 学习顺序
 1. 获取元素
 2. 修改文本、类名、样式
 3. 创建和删除节点
 4. 点击事件
 5. 表单提交和 `preventDefault`
 6. 冒泡、委托和 `stopPropagation`
 7. `setTimeout` 和异步顺序
 8. Promise 渲染
 9. `async` / `await`
 10. 综合小页面
 11. `input` / `change` 事件
 12. `prepend`、`classList.remove` 和链接默认行为
 ## 练习目录
 - [01-query-selectors/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/01-query-selectors/README.md)
 - [02-text-class-style/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/02-text-class-style/README.md)
 - [03-create-and-remove/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/03-create-and-remove/README.md)
 - [04-click-counter/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/README.md)
 - [05-form-submit-and-prevent-default/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/05-form-submit-and-prevent-default/README.md)
 - [06-bubbling-and-delegation/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/README.md)
 - [07-timers-and-async-order/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/README.md)
 - [08-promise-and-render/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/08-promise-and-render/README.md)
 - [09-async-await-panel/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/09-async-await-panel/README.md)
 - [10-final-dashboard/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/10-final-dashboard/README.md)
 - [11-input-live-preview/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/README.md)
 - [12-prepend-remove-and-link-default/README.md](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/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：
 - 能正确选中页面里的元素
 - 能改文字、类名和内联样式
 - 能动态创建和删除列表项
 - 能给按钮、表单绑定事件
 - 能理解事件冒泡和事件委托
 - 能在需要时使用 `preventDefault()` 和 `stopPropagation()`
 - 能处理 `input` / `change` 这类常见表单事件
 - 能使用 `prepend()`、`classList.remove()` 完成简单 DOM 调整
 - 能理解 `setTimeout` 的异步顺序
 - 能用 Promise 和 `async` / `await` 处理一个简单异步流程
 - 能做出一个有真实交互的小页面
 ## 学习建议
 - 每个练习都用浏览器打开 `starter.html`
 - 打开开发者工具，边看页面边看控制台
 - 一个交互没反应时，先确认元素有没有选中
 - 一个异步结果不对时，先打印中间状态
--- a/05-es6-plus/01-template-and-destructuring/README.md
+++ b/05-es6-plus/01-template-and-destructuring/README.md
@@ -0,0 +1,24 @@
 # 练习 1：模板字符串和解构
 ## 目标
 学会用模板字符串拼接信息，并用解构快速读取对象和数组数据。
 ## 你要练什么
 - 模板字符串
 - 对象解构
 - 数组解构
 ## 任务
 - 从 `student` 对象里解构出姓名和阶段
 - 从 `scores` 数组里解构出前两个分数
 - 用模板字符串把这些信息渲染到页面
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/01-template-and-destructuring/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/01-template-and-destructuring/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/01-template-and-destructuring/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/01-template-and-destructuring/answer.js)
--- a/05-es6-plus/01-template-and-destructuring/answer.html
+++ b/05-es6-plus/01-template-and-destructuring/answer.html
@@ -0,0 +1,16 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>模板字符串和解构</title>
  </head>
  <body>
    <section>
      <h1>ES6+ 练习 1</h1>
      <p id="output">等待渲染</p>
    </section>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/05-es6-plus/01-template-and-destructuring/answer.js
+++ b/05-es6-plus/01-template-and-destructuring/answer.js
@@ -0,0 +1,11 @@
 const student = {
  name: "林晨",
  stage: "ES6+",
 };
 const scores = [88, 92, 95];
 const { name, stage } = student;
 const [firstScore, secondScore] = scores;
 document.getElementById("output").textContent = `${name} 正在学习 ${stage}，前两次练习分数分别是 ${firstScore} 和 ${secondScore}。`;
--- a/05-es6-plus/01-template-and-destructuring/starter.html
+++ b/05-es6-plus/01-template-and-destructuring/starter.html
@@ -0,0 +1,16 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>模板字符串和解构</title>
  </head>
  <body>
    <section>
      <h1>ES6+ 练习 1</h1>
      <p id="output">等待渲染</p>
    </section>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/05-es6-plus/01-template-and-destructuring/starter.js
+++ b/05-es6-plus/01-template-and-destructuring/starter.js
@@ -0,0 +1,18 @@
 const student = {
  name: "林晨",
  stage: "ES6+",
 };
 const scores = [88, 92, 95];
 // 任务：
 // 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/README.md
+++ b/05-es6-plus/02-spread-and-rest/README.md
@@ -0,0 +1,24 @@
 # 练习 2：展开运算符和剩余参数
 ## 目标
 学会复制数组、合并对象，以及用剩余参数接收不定数量的参数。
 ## 你要练什么
 - 数组展开
 - 对象展开
 - 剩余参数
 ## 任务
 - 复制一份课程数组并新增一项
 - 基于用户对象生成一个更新后的对象
 - 写一个 `sumScores` 函数，用剩余参数计算总分
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/02-spread-and-rest/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/02-spread-and-rest/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/02-spread-and-rest/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/02-spread-and-rest/answer.js)
--- a/05-es6-plus/02-spread-and-rest/answer.html
+++ b/05-es6-plus/02-spread-and-rest/answer.html
@@ -0,0 +1,12 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>展开运算符和剩余参数</title>
  </head>
  <body>
    <pre id="output"></pre>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/05-es6-plus/02-spread-and-rest/answer.js
+++ b/05-es6-plus/02-spread-and-rest/answer.js
@@ -0,0 +1,24 @@
 const tracks = ["HTML", "CSS", "JavaScript"];
 const user = {
  name: "林晨",
  stage: "基础阶段",
 };
 function sumScores(...scores) {
  return scores.reduce((total, score) => total + score, 0);
 }
 const newTracks = [...tracks, "ES6+"];
 const nextUser = { ...user, stage: "现代 JS" };
 const totalScore = sumScores(88, 91, 95);
 document.getElementById("output").textContent = JSON.stringify(
  {
    newTracks,
    nextUser,
    totalScore,
  },
  null,
  2
 );
--- a/05-es6-plus/02-spread-and-rest/starter.html
+++ b/05-es6-plus/02-spread-and-rest/starter.html
@@ -0,0 +1,12 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>展开运算符和剩余参数</title>
  </head>
  <body>
    <pre id="output"></pre>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/05-es6-plus/02-spread-and-rest/starter.js
+++ b/05-es6-plus/02-spread-and-rest/starter.js
@@ -0,0 +1,32 @@
 const tracks = ["HTML", "CSS", "JavaScript"];
 const user = {
  name: "林晨",
  stage: "基础阶段",
 };
 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：
 // 1. 复制 tracks 并新增 "ES6+"
 // 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/README.md
+++ b/05-es6-plus/03-arrow-functions/README.md
@@ -0,0 +1,23 @@
 # 练习 3：箭头函数
 ## 目标
 学会把简单函数改写成箭头函数。
 ## 你要练什么
 - 箭头函数
 - 简写返回值
 - 数组映射
 ## 任务
 - 把两个普通函数改成箭头函数
 - 用 `map` 和箭头函数生成课程标签
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/03-arrow-functions/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/03-arrow-functions/starter.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/03-arrow-functions/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/03-arrow-functions/answer.js)
--- a/05-es6-plus/03-arrow-functions/answer.html
+++ b/05-es6-plus/03-arrow-functions/answer.html
@@ -0,0 +1,12 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>箭头函数</title>
  </head>
  <body>
    <pre id="output"></pre>
    <script src="./answer.js"></script>
  </body>
 </html>
--- a/05-es6-plus/03-arrow-functions/answer.js
+++ b/05-es6-plus/03-arrow-functions/answer.js
@@ -0,0 +1,15 @@
 const getLevel = (score) => (score >= 80 ? "达标" : "继续练习");
 const add = (a, b) => a + b;
 const tracks = ["DOM", "异步", "模块化"];
 const labels = tracks.map((track) => `[${track}]`);
 document.getElementById("output").textContent = JSON.stringify(
  {
    level: getLevel(86),
    sum: add(12, 8),
    labels,
  },
  null,
  2
 );
--- a/05-es6-plus/03-arrow-functions/starter.html
+++ b/05-es6-plus/03-arrow-functions/starter.html
@@ -0,0 +1,12 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>箭头函数</title>
  </head>
  <body>
    <pre id="output"></pre>
    <script src="./starter.js"></script>
  </body>
 </html>
--- a/05-es6-plus/03-arrow-functions/starter.js
+++ b/05-es6-plus/03-arrow-functions/starter.js
@@ -0,0 +1,18 @@
 function getLevel(score) {
  return score >= 80 ? "达标" : "继续练习";
 }
 function add(a, b) {
  return a + b;
 }
 const tracks = ["DOM", "异步", "模块化"];
 // 任务：
 // 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
@@ -0,0 +1,24 @@
 # 
 练习 4：模块基础
 ## 目标
 学会用 `export` 和 `import` 把不同文件连起来。
 ## 你要练什么
 - `export`
 - `import`
 - `type="module"`
 ## 任务
 - 从模块文件里导入课程数据和格式化函数
 - 把结果渲染到页面
 ## 文件
 - [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/04-modules-basic/starter.html)
 - [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/04-modules-basic/starter.js)
 - [course-data.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/04-modules-basic/course-data.js)
 - [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/04-modules-basic/answer.html)
 - [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/04-modules-basic/answer.js)
--- a/05-es6-plus/04-modules-basic/answer.html
+++ b/05-es6-plus/04-modules-basic/answer.html
@@ -0,0 +1,12 @@
 <!DOCTYPE html>
 <html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>模块基础</title>
  </head>
  <body>
    <pre id="output"></pre>
    <script type="module" src="./answer.js"></script>
  </body>
 </html>
--- a/05-es6-plus/04-modules-basic/answer.js
+++ b/05-es6-plus/04-modules-basic/answer.js
@@ -0,0 +1,4 @@
 import { courses, formatCourse } from "./course-data.js";
 const lines = courses.map((course) => formatCourse(course));
 document.getElementById("output").textContent = lines.join("\n");
--- 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
charlie	7be97e7ea7	Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example	2026-03-19 10:06:17 +08:00
charlie	f3bdaa4e88	feat: add TypeScript lessons and learning panel - Introduced a new script to check TypeScript lesson files for errors. - Created a main TypeScript file to render lessons and their details. - Added lesson definitions with starter and answer codes. - Implemented a user interface for navigating and running lessons. - Styled the application with CSS for a better user experience. - Updated README to reflect the new TypeScript section and usage instructions.	2026-03-19 10:06:11 +08:00
rou	81004b437c	Merge branch 'main' of https://gitea.lililibra.cn/rou/front-end-example	2026-03-13 23:56:45 +08:00
rou	295fe875a3	update	2026-03-13 23:55:18 +08:00