清除浮动的三种方法
<!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>Document</title>
</head>
<style>
.clear {
clear: both;
height: 0;
line-height: 0;
font-size: 0
}
</style>
<body>
<div class="outer">
<div class="div1">1</div>
<div class="div2">2</div>
<div class="div3">3</div>
<div class="clear"></div>
</div>
</body>
</html>
<!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>
</head>
<style>
.over-flow {
overflow: auto;
zoom: 1;
}
</style>
<body>
<div class="outer over-flow">
<div class="div1">1</div>
<div class="div2">2</div>
<div class="div3">3</div>
</div>
</body>
</html>
- :after 方法：（注意：作用于浮动元素的父亲）
<!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>
</head>
<style>
.clearfix {
zoom: 1;
}
.clearfix:after {
clear: both;
content: '';
display: block;
width: 0;
height: 0;
visibility: hidden;
}
</style>
<body>
<div class="clearfix">
<div class="div1">1</div>
<div class="div2">2</div>
<div class="div3">3</div>
</div>
</body>
</html>
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