这里只是说开发使用的清除浮动方法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style type="text/css">
.one1{
height: 70px;
width: 60px;
background: greenyellow;
float:left;
}
.one2{
height: 90px;
width: 100px;
background: yellow;
float: left;
}
.one3{
height: 120px;
width: 150px;
background: #b3d4fc;
/*float:left;*/
}
.box{
width: 200px;
/*height: 200px;*/
background: #888888;
/*float: left;*/
/*overflow: hidden;*/
}
.clearfix:after{
content: "020";
display: block;
height: 0;
clear: both;
visibility: hidden;
}
</style>
<title>Title</title>
</head>
<body>
//此处box的float 不要设置如果是下面有一个盒子。如果设置了就清除不了浮动了
<div class="clearfix box">
<div class="one1"> 1</div>
<div class="one2"> 2</div>
</div>
<div class="one3">3 </div>
</body>
</html>