清楚浮动的方法

清楚浮动的两种方法:

方法一:给float标签的父级标签添加overflow: hidden/auto属性 例如:css

<!DOCTYPE html>
<html>
<head>
    <title>DIVCSS5实例 DIV与DIV覆盖</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style>
        .boxa{overflow: hidden;}
        .boxa,.boxb{ margin:0 auto; width:400px;}
        .boxa-l{ float:left; width:280px; height:80px; border:1px solid #F00}
        .boxa-r{ float:right; width:100px; height:80px; border:1px solid #F00}
        .boxb{ border:1px solid #000; height:40px; background:#999}
    </style>
</head>
<body>
<div class="boxa"><!--方法一:给float标签的父级标签添加overflow: hidden属性-->
    <div class="boxa-l">内容左</div>
    <div class="boxa-r">内容右</div>
</div>
<div class="boxb">boxb盒子里的内容</div>
</body>
</html>

方法二:在float标签的父级标签闭合以前添加标签,使用clear:both清楚浮动html

<!DOCTYPE html>
<html>
<head>
    <title>DIVCSS5实例 DIV与DIV覆盖</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style>
        .boxa,.boxb{ margin:0 auto; width:400px;}
        .boxa-l{ float:left; width:280px; height:80px; border:1px solid #F00}
        .boxa-r{ float:right; width:100px; height:80px; border:1px solid #F00}
        .boxb{ border:1px solid #000; height:40px; background:#999}
        .clear{clear: both;}
    </style>
</head>
<body>
<div class="boxa">
    <div class="boxa-l">内容左</div>
    <div class="boxa-r">内容右</div>
    <div class="clear"></div><!--方法二:在float标签的父级标签闭合以前添加标签,使用clear:both清楚浮动-->
</div>
<div class="boxb">boxb盒子里的内容</div>
</body>
</html>

方法三:借助给父级元素添加after伪类框架

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta name="author" content="Chomo"/>
    <link rel="start" href="http://www.14px.com" title="Home"/>
    <title>利用box-sizing实现div仿框架</title>
    <style type="text/css">
        *{margin: 0;padding: 0;}
        .parent{width: 300px; border: 1px solid;}
        .son{width: 20px; height: 20px; background: #EE4063; float: left;}
        span{float: right;}
        .clear:after{
            content: "."; /*添加句号*/
            height: 0; /*让高度为0,不然会撑大父级框*/
            visibility: hidden; /*让句号只站位不显示*/
            display: block; /*必定要块级框显示,不然撑不开*/
            clear: both;/*清楚浮动*/
        }
    </style>
</head>
<body>
<div class="parent clear">
    <div class="son"></div>
    <span>操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人操盘达人</span>
</div>
</body>
</html>
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