清除浮动——after伪元素法

语法：

.clearfix:after{
                    content: "";
                    display: block;
                    height: 0;
                    clear: both;
                    visibility: hidden;
       }

       .clearfix{
                /* IE6、7专用 */
                *zoom: 1;
       }

代码：

<!DOCTYPE html>
<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>为什么清除浮动</title>
    <style>

       .clearfix:after{
                    content: "";
                    display: block;
                    height: 0;
                    clear: both;
                    visibility: hidden;
       }

       .clearfix{
                /* IE6、7专用 */
                *zoom: 1;
       }

        .box{
                width: 800px;
                border: 1px solid blue;
                margin: 0 auto;
        }
 
        .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 clearfix">
                    <div class="damao">大毛</div>
                    <div class="ermao">二毛</div>
            </div>

            <div class="footer"></div>
</body>

</html>

运行效果

这种方法只需复制和调用即可

清除浮动——after伪元素法

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