方法1:在浮动元素后面增加空白元素用上clear:both
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>清除浮动</title>
<style>
.box {
background-color: #2AB561;
border: 1px solid red;
}
.one {
width: 100px;
height: 50px;
background-color: #0DA5D6;
float: left;
}
.two {
float: left;
width: 100px;
height: 50px;
background-color: #1b6d85;
}
.three {
width: 200px;
height: 100px;
background-color: #0f0f0f;
}
.four{
clear: both;
}
</style>
</head>
<body>
<div class="box">
<div class="one"></div>
<div class="two"></div>
<div class="four"></div>
</div>
<div class="three"></div>
</body>
</html>
方法2:父级添加overflow：hidden
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>清除浮动</title>
<style>
.box {
background-color: #2AB561;
border: 1px solid red;
/*overflow触发BFC，BFC可以清除浮动*/
overflow: hidden;
}
.one {
width: 100px;
height: 50px;
background-color: #0DA5D6;
float: left;
}
.two {
float: left;
width: 100px;
height: 50px;
background-color: #1b6d85;
}
.three {
width: 200px;
height: 100px;
background-color: #0f0f0f;
}
</style>
</head>
<body>
<div class="box">
<div class="one"></div>
<div class="two"></div>
</div>
<div class="three"></div>
</body>
</html>
方法3:添加伪元素
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>清除浮动</title>
<style>
.box {
background-color: #2AB561;
border: 1px solid red;
}
.one {
width: 100px;
height: 50px;
background-color: #0DA5D6;
float: left;
}
.two {
float: left;
width: 100px;
height: 50px;
background-color: #1b6d85;
}
.three {
width: 200px;
height: 100px;
background-color: #0f0f0f;
}
.clearFloat:after {
/*避免有空隙*/
content: '.';
/*变成块级元素*/
display: block;
/*隐藏content*/
visibility: hidden;
clear: both;
/*清除盒子高度*/
height: 0;
}
.clearFloat {
/*兼容IE6，7*/
*zoom: 1;
}
</style>
</head>
<body>
<div class="box clearFloat">
<div class="one"></div>
<div class="two"></div>
</div>
<div class="three"></div>
</body>
</html>
方法4:双伪元素清除浮动
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>清除浮动</title>
<style>
.box {
background-color: #2AB561;
border: 1px solid red;
}
.one {
width: 100px;
height: 50px;
background-color: #0DA5D6;
float: left;
}
.two {
float: left;
width: 100px;
height: 50px;
background-color: #1b6d85;
}
.three {
width: 200px;
height: 100px;
background-color: #0f0f0f;
}
.clearFloat:before ,.clearFloat:after {
/*避免有空隙*/
content: '';
/*变成块级元素*/
display: table;
}
.clearFloat:after{
clear: both;
}
.clearFloat {
/*兼容IE6，7*/
*zoom: 1;
}
</style>
</head>
<body>
<div class="box clearFloat">
<div class="one"></div>
<div class="two"></div>
</div>
<div class="three"></div>
</body>
</html>
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