a标签的4个作用

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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 1.可以跳转百度 a标签相当于是锚点 可以添加target 属性新开一个页面-->
    <a href="http://www.baidu.com" target="_blank">跳转百度</a>
    <!-- 2.可以打电话/发邮件 -->
    <a href="tel:151724924**">联系商家</a>
    <a href="mailto:1577689**8@qq.com">发邮件</a>
    <!-- 3.协议限定符 /可以写js代码-->
    <!-- <a href="javascript:while(1){alert('你能关掉吗')}">点我呀</a> -->
    <!-- 4.可以作为锚点,点击回到顶端或者指定的位置 -->
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    <div id="demo1">
       <span>
        import * as GridZoneApi from '@/api/grid/gridZone.js'
        import AMapLoader from '@/utils/amap-jsapi-loader'
        import AreaTreeSelector from "@/components/AreaTreeSelector";
        import * as GridZoneApi from '@/api/grid/gridZone.js'
        import AMapLoader from '@/utils/amap-jsapi-loader'
        import AreaTreeSelector from "@/components/AreaTreeSelector";
        </span>
    </div>
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    <div id="demo2" style="color: blue;">
        import * as GridZoneApi from '@/api/grid/gridZone.js'
        import AMapLoader from '@/utils/amap-jsapi-loader'
        import AreaTreeSelector from "@/components/AreaTreeSelector";
        import * as GridZoneApi from '@/api/grid/gridZone.js'
        import AMapLoader from '@/utils/amap-jsapi-loader'
        import AreaTreeSelector from "@/components/AreaTreeSelector";
    </div>
    <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    <a href="#demo1" style="width:100px;height: 20px; border-radius: 5px; border: 1px solid green;position: fixed; top: 50px; right: 50px;">找到demo1</a>
    <a href="#demo2" style="width:100px;height: 20px; border-radius: 5px; border: 1px solid yellow; position: fixed; top: 30px; right: 50px;">找到demo2</a>
</body>
</html>