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.
This commit is contained in:
charlie
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# 练习 12：prepend、classList.remove 和链接默认行为
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## 目标
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补齐几个常见但容易漏掉的 DOM 细节操作。
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## 你要练什么
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- `prepend()`
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- `classList.remove()`
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- 链接点击事件
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- `preventDefault()`
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## 任务
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- 点击“插入到最前面”时，把一条新消息插入列表顶部
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- 点击“清除高亮”时，移除全部高亮类名
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- 点击帮助链接时，阻止默认跳转，并在页面显示提示信息
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## 文件
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- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/starter.html)
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- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/starter.js)
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- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/answer.html)
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- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/12-prepend-remove-and-link-default/answer.js)
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>prepend、classList.remove 和链接默认行为</title>
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<style>
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body {
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margin: 0;
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padding: 32px;
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font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
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background: #f5f7fb;
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}
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.panel {
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max-width: 760px;
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margin: 0 auto;
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padding: 24px;
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border-radius: 18px;
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background: #ffffff;
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border: 1px solid #dce4ef;
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}
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.item {
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margin-top: 10px;
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padding: 12px 14px;
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border-radius: 12px;
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border: 1px solid #dbe4f0;
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}
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.item.active {
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background: #dbeafe;
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}
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.actions {
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display: flex;
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gap: 10px;
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flex-wrap: wrap;
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}
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</style>
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</head>
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<body>
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<section class="panel">
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<h1>补漏练习</h1>
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<div class="actions">
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<button id="prepend-btn" type="button">插入到最前面</button>
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<button id="clear-active-btn" type="button">清除高亮</button>
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<a id="help-link" href="https://example.com/help">查看帮助</a>
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</div>
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<p id="hint-text">这里会显示操作提示。</p>
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<ul id="message-list">
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<li class="item active">先学事件监听</li>
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<li class="item active">再学异步顺序</li>
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<li class="item">最后做综合页面</li>
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</ul>
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</section>
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<script src="./answer.js"></script>
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</body>
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</html>
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const prependButton = document.getElementById("prepend-btn");
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const clearActiveButton = document.getElementById("clear-active-btn");
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const helpLink = document.getElementById("help-link");
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const hintText = document.getElementById("hint-text");
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const messageList = document.getElementById("message-list");
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let messageIndex = 1;
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prependButton.addEventListener("click", function () {
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const item = document.createElement("li");
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item.className = "item active";
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item.textContent = `新插入的提醒 ${messageIndex}`;
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messageList.prepend(item);
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hintText.textContent = "已把一条消息插入到最前面";
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messageIndex += 1;
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});
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clearActiveButton.addEventListener("click", function () {
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const items = document.querySelectorAll(".item");
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items.forEach(function (item) {
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item.classList.remove("active");
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});
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hintText.textContent = "已移除全部高亮状态";
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});
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helpLink.addEventListener("click", function (event) {
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event.preventDefault();
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hintText.textContent = "已阻止默认跳转";
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});
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>prepend、classList.remove 和链接默认行为</title>
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<style>
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body {
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margin: 0;
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padding: 32px;
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font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
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background: #f5f7fb;
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}
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.panel {
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max-width: 760px;
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margin: 0 auto;
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padding: 24px;
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border-radius: 18px;
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background: #ffffff;
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border: 1px solid #dce4ef;
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}
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.item {
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margin-top: 10px;
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padding: 12px 14px;
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border-radius: 12px;
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border: 1px solid #dbe4f0;
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}
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.item.active {
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background: #dbeafe;
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}
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.actions {
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display: flex;
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gap: 10px;
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flex-wrap: wrap;
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}
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</style>
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</head>
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<body>
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<section class="panel">
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<h1>补漏练习</h1>
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<div class="actions">
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<button id="prepend-btn" type="button">插入到最前面</button>
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<button id="clear-active-btn" type="button">清除高亮</button>
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<a id="help-link" href="https://example.com/help">查看帮助</a>
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</div>
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<p id="hint-text">这里会显示操作提示。</p>
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<ul id="message-list">
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<li class="item active">先学事件监听</li>
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<li class="item active">再学异步顺序</li>
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<li class="item">最后做综合页面</li>
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</ul>
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</section>
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<script src="./starter.js"></script>
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</body>
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</html>
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@@ -0,0 +1,6 @@
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// 任务：
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// 1. 获取两个按钮、帮助链接、提示文字和列表
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// 2. 点击 prepend-btn 时创建新 li，并插入到列表最前面
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// 3. 点击 clear-active-btn 时移除所有 item 的 active 类名
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// 4. 点击帮助链接时，用 preventDefault() 阻止跳转
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// 5. 在提示文字里输出“已阻止默认跳转”
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