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docs/bom/navigator.md

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### Navigator.userAgent
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`navigator.userAgent`属性返回浏览器的 User Agent 字符串,表示浏览器的厂商和版本信息
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`navigator.userAgent`属性返回浏览器的 User Agent 字符串,表示用户设备信息,包含了浏览器的厂商、版本、操作系统等信息
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下面是 Chrome 浏览器的`userAgent`
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```javascript
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var ua = navigator.userAgent.toLowerCase();
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if (/mobi/i.test(ua)) {
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if (/mobi/.test(ua)) {
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// 手机浏览器
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} else {
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// 非手机浏览器
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如果想要识别所有移动设备的浏览器,可以测试更多的特征字符串。
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```javascript
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/mobi|android|touch|mini/i.test(ua)
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/mobi|android|touch|mini/.test(ua)
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```
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### Navigator.plugins

docs/dom/css.md

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### 基本用法
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`window.matchMedia`方法用来将 CSS 的[`MediaQuery`](https://developer.mozilla.org/en-US/docs/DOM/Using_media_queries_from_code)条件语句,转换成一个 MediaQueryList 实例。
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`window.matchMedia()`方法用来将 CSS 的[`Media Query`](https://developer.mozilla.org/en-US/docs/DOM/Using_media_queries_from_code)条件语句,转换成一个 MediaQueryList 实例。
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```javascript
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var mdl = window.matchMedia('(min-width: 400px)');

package-lock.json

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