清除浮动的4种方法

「爱情、让人受尽委屈。」 2023-07-03 04:52 99阅读 0赞

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

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzQxNzU3_size_16_color_FFFFFF_t_70]  
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>
        
        <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>
        
        <div class="box clearfix">
            <div class="damao">大毛</div>
            <div class="ermao">二毛</div>
        </div>
        <div class="footer"></div>
    </body>
    </html>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzQxNzU3_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200202153658910.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMzQxNzU3,size_16,color_FFFFFF,t_70