消除浮动的四种方法

原创于 2023-04-16 17:34:21 发布 · 910 阅读

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文章介绍了清除浮动的四种常见方法：1)额外标签法，通过添加一个带有清除浮动样式的额外标签；2)父级元素添加overflow属性；3)使用:after伪元素法，创建一个清除浮动的隐藏块；4)双伪元素法，同时使用:before和:after伪元素来清除浮动。这些方法有助于解决浮动元素对页面布局的影响。

一、额外标签法（隔墙法）：

通过在最后一个浮动的子元素后面添加一个额外标签，添加清除浮动样式，但在实际工作中不常用。

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>额外标签法</title>
    <style>
        .box {
            border: 1px solid blue;
        }

        .damao {
            background-color: pink;
            width: 200px;
            height: 100px;
            float: left;
        }

        .ermao {
            background-color: skyblue;
            width: 200px;
            height: 100px;
            float: left;
        }

        .footer {
            height: 200px;
            background-color: black;
        }

        .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>

二、通过父级元素添加overflow：

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>额外标签法</title>
    <style>
        .box {
            border: 1px solid blue;
        }

        .damao {
            background-color: pink;
            width: 200px;
            height: 100px;
            float: left;
        }

        .ermao {
            background-color: skyblue;
            width: 200px;
            height: 100px;
            float: left;
        }

        .footer {
            height: 200px;
            background-color: black;
        }

        .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>

三、通过after伪元素法：

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>:after伪元素法</title>
    <style>
        .clearfix:after {
            content: "";
            display: block;
            height: 0;
            clear: both;
            visibility: hidden;
        }

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

        .box {
            width: 400px;
            border: 1px solid blue;
            margin: 0 auto;
        }

        .damao {
            background-color: pink;
            width: 200px;
            height: 100px;
            float: left;
        }

        .ermao {
            background-color: skyblue;
            width: 200px;
            height: 100px;
            float: left;
        }

        .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>

四、通过双伪元素法：

<!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>双伪元素法</title>
    <style>
        .clearfix::before,
        .clearfix:after {
            content: "";
            display: block;
        }

        .clearfix:after {
            clear: both;
        }

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

        .box {
            width: 400px;
            border: 1px solid blue;
            margin: 0 auto;
        }

        .damao {
            background-color: pink;
            width: 200px;
            height: 100px;
            float: left;
        }

        .ermao {
            background-color: skyblue;
            width: 200px;
            height: 100px;
            float: left;
        }

        .footer {
            height: 200px;
            background-color: black;
        }
    </style>
</head>
cs
<body>
    <div class="box clearfix">
        <div class="damao">大毛</div>
        <div class="ermao">二毛</div>

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

</html>

运行结果：