清除浮动的常见方式

1.在结尾处添加空div标签，设置属性clear：both

<!DOCTYPE html>
<html lang="en">
<head>
    <style type="text/css">
        .div1{background:#000080;border:1px solid red}
        .div2{background:#800080;border:1px solid red;height:100px;margin-top:10px}

        .left{float:left;width:20%;height:200px;background:#DDD}
        .right{float:right;width:30%;height:80px;background:#DDD}

        /*清除浮动代码*/
        .clearfloat{clear:both}
    </style>

</head>
<body>
<div class="div1">
    <div class="left">Left</div>
    <div class="right">Right</div>
    <div class="clearfloat"></div>
</div>
<div class="div2">
    div2
</div>
</body>
</html>

2.给父级元素定义一个固定高度

<!DOCTYPE html>
<html lang="en">
<head>
    <style type="text/css">
        .div1{background:#000080;border:1px solid red;height:200px;}
        .div2{background:#800080;border:1px solid red;height:100px;margin-top:10px}

        .left{float:left;width:20%;height:200px;background:#DDD}
        .right{float:right;width:30%;height:80px;background:#DDD}
    </style>

</head>
<body>
<div class="div1">
    <div class="left">Left</div>
    <div class="right">Right</div>
</div>
<div class="div2">
    div2
</div>
</body>
</html>

3.父级div定义overflow：hidden；或者定义overflow：auto；注意父级div必须定义宽度，不能定义高度

<!DOCTYPE html>
<html lang="en">
<head>
    <style type="text/css">
        .div1{background:#000080;border:1px solid red;width:98%;overflow:hidden;}
        .div2{background:#800080;border:1px solid red;height:100px;margin-top:10px}

        .left{float:left;width:20%;height:200px;background:#DDD}
        .right{float:right;width:30%;height:80px;background:#DDD}
    </style>

</head>
<body>
<div class="div1">
    <div class="left">Left</div>
    <div class="right">Right</div>
</div>
<div class="div2">
    div2
</div>
</body>
</html>

4.父级div也一起浮动（不推荐）

5.最优方案：父级div定义伪类after，zoom

<style type="text/css"> 
   .div1{background:#000080;border:1px solid red;}
   .div2{background:#800080;border:1px solid red;height:100px;margin-top:10px}
   
   .left{float:left;width:20%;height:200px;background:#DDD}
   .right{float:right;width:30%;height:80px;background:#DDD}
   
   /*清除浮动代码*/
   .clearfloat:after{display:block;clear:both;content:"";visibility:hidden;height:0}
   .clearfloat{zoom:1}
   </style> 
<div class="div1 clearfloat"> 
<div class="left">Left</div> 
<div class="right">Right</div> 
</div>
<div class="div2">
   div2
   </div>

清除浮动的常见方式

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