清除浮动的4种方法

1.额外标签法：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>额外标签法</title>
    <style>
        .box{
            width:1000px;
            margin: 0 auto;
            border: 1px solid blue;
        }
       .damao{
           float: left;
           width: 300px;
           height: 200px;
           background-color: purple;
       }
       .ermao{
           float: left;
           width: 200px;
           height: 200px;
           background-color: pink;
       }
       .footer{
           height: 200px;
           background-color: black;
       }
       /* 清除浮动 */
       .clear{
           clear: both;
       }
    </style>

</head>

<body>
    <div class="box">
        <div class="damao">大毛</div>
        <div class="ermao">二毛</div>
        <!-- 此处增加一个div -->
        <div class="clear"></div>
    </div>
    <div class="footer"></div>
</body>
</html>

在这里插入图片描述
要求：添加的元素必须是块级元素，不能是行内元素。div属于块级元素。而如果是span则不能清除浮动。

2.给父亲添加overflow：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>给父亲添加overflow</title>
    <style>
        .box{
            /* 清除浮动 */
            overflow: hidden;
            width:1000px;
            margin: 0 auto;
            border: 1px solid blue;
        }
       .damao{
           float: left;
           width: 300px;
           height: 200px;
           background-color: purple;
       }
       .ermao{
           float: left;
           width: 200px;
           height: 200px;
           background-color: pink;
       }
       .footer{
           height: 200px;
           background-color: black;
       }
    </style>

</head>

<body>
    <div class="box">
        <div class="damao">大毛</div>
        <div class="ermao">二毛</div>
    </div>
    <div class="footer"></div>
</body>
</html>

3.after伪元素：给父元素添加。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>伪元素清除浮动</title>
    <style>
        /* 增加伪类代码 */
        .clearfix::after{
            content: "";
            display: block;
            height: 0;
            clear: both;
            visibility: hidden;
        }
        /* 兼容IE6 &7 */
        .clearfix{
            *zoom: 1;
        }
        .box{
            width:1000px;
            margin: 0 auto;
            border: 1px solid blue;
        }
       .damao{
           float: left;
           width: 300px;
           height: 200px;
           background-color: purple;
       }
       .ermao{
           float: left;
           width: 200px;
           height: 200px;
           background-color: pink;
       }
       .footer{
           height: 200px;
           background-color: black;
       }
    </style>

</head>

<body>
    <!-- 父元素调用clearfix -->
    <div class="box clearfix">
        <div class="damao">大毛</div>
        <div class="ermao">二毛</div>
    </div>
    <div class="footer"></div>
</body>
</html>

4：双伪元素清除浮动：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>双伪元素清除浮动</title>
    <style>
        /* 增加伪类代码 */
        .clearfix::before,
        .clearfix::after{
            content: "";
            display: table;
        }
        .clearfix::after{
            clear: both;
        }
        .clearfix{
            *zoom: 1;
        }
        .box{
            width:1000px;
            margin: 0 auto;
            border: 1px solid blue;
        }
       .damao{
           float: left;
           width: 300px;
           height: 200px;
           background-color: purple;
       }
       .ermao{
           float: left;
           width: 200px;
           height: 200px;
           background-color: pink;
       }
       .footer{
           height: 200px;
           background-color: black;
       }
    </style>

</head>

<body>
    <!-- 父元素调用clearfix -->
    <div class="box clearfix">
        <div class="damao">大毛</div>
        <div class="ermao">二毛</div>
    </div>
    <div class="footer"></div>
</body>
</html>

来源：CSDN

作者：无敌帅气软件学长

链接：https://blog.csdn.net/qq_41341757/article/details/104145380

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