清除浮动

浮动要封闭到一个盒子当中,否则就会对页面后续的元素产生影响

清除浮动

一、overflow: hidden

不加overflow: hidden前

给父元素添加overflow: hidden后

点击查看代码 
<!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>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        /* 让内部有浮动的父盒子形成BFC，它就能关闭住内部的浮动 */
        div {
            overflow: hidden;
            margin: 10px;
        }

        p {
            width: 100px;
            height: 100px;
            background-color: pink;
            margin-right: 10px;
            float: left;
        }

        .red {
            background-color: red;
        }
    </style>
</head>

<body>
    <div>
        <p></p>
        <p></p>
    </div>
    <div>
        <p class="red"></p>
        <p class="red"></p>
    </div>
</body>

</html>

二、clear: both(不推荐)

在两个父盒子之间添加一个属性为clear: both;的盒子
clear 表示清除浮动对自己的影响，both 表示左右浮动都清除

给浮动后面的元素添加clear: both;后

点击查看代码 
<!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>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            margin: 10px;
        }

        p {
            width: 100px;
            height: 100px;
            background-color: pink;
            margin-right: 10px;
            float: left;
        }

        .blue {
            background-color: blue;
        }

        .clear {
            clear: both;
        }
    </style>

</head>

<body>
    <div class="box">
        <p></p>
        <p></p>
    </div>
    <div class="clear"></div>
    <div class="box">
        <p class="blue"></p>
        <p class="blue"></p>
    </div>
</body>

</html>

三、伪元素::after(强烈推荐)

给盒子添加最后一个子元素添加 ::after伪元素
并且给 ::after 设置 clear:both;

添加伪元素::after后

点击查看代码 
<!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>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        div {
            margin: 10px;
        }

        .box::after {
            content: "";
            clear: both;
            /* 转化为块级元素 */
            display: block;
        }

        p {
            width: 100px;
            height: 100px;
            background-color: pink;
            margin-right: 10px;
            float: left;
        }

        .yellow {
            background-color: yellow;
        }
    </style>
</head>

<body>
    <div class="box">
        <p></p>
        <p></p>
    </div>
    <div class="box">
        <p class="yellow"></p>
        <p class="yellow"></p>
    </div>
</body>

</html>
posted @ 2022-10-03 18:42  L-L  阅读(16)  评论(0)  编辑  收藏  举报