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add ajax 简介链接

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docs/chapter03.md
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@ -208,6 +208,9 @@ async function example() {
#### 3.3.2 XMLHttpRequest对象的使用 (了解)
[AJAX 简介](https://www.runoob.com/ajax/ajax-intro.html)
- **基本用法：** 创建对象、设置请求类型、发送请求、处理响应。
- **事件监听：** 监听 `onreadystatechange` 事件来获取服务器响应的状态。
- **请求方法：** `open` 方法设置请求类型和URL，`send` 方法发送请求。