老师，为什么用你上节课说的那个就无法清除成功？但是直接就写clear:both;就可以了？

来源：5-4 编程练习

Heijyu

2020-07-01 23:56:42

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .per{
            width: 300px;
            height: auto;
            border:2px solid #aaa;
        }
        .li{
            width: 100px;
            height: 100px;
            background: red;
            margin: 5px;
            float: left;
        }
        /*此处写代码*/
        #clearDiv::after{
            content = "";
            visibility:hidden;
            height:0px;
            display:block;
            clear:both;
        }
       写下面注释的这个就可以了
       /* #clearDiv{
            clear:both;*/
        }
    </style>
</head>
<body>
    <div class="per">
        <div class="li"></div>
        <div class="li"></div>
        <!-- 此处写代码 -->
        <div id = "clearDiv"></div>
    </div>
</body>
</html>

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