# 双飞翼布局
# flex实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>双飞翼flex</title>
<style>
html,
body {
height: 100%;
}
body {
padding: 0;
margin: 0;
display: flex;
flex-direction: column;
}
.header,
.footer {
background: red;
flex: 0 0 auto;
}
#section {
display: flex;
flex: 1 1 auto;
/*
flex-grow: 1;
flex-shrink: 1;
flex-basis: auto; */
}
.left {
order: -1;
}
.left,
.right {
flex: 0 0 20%;
background: blue;
}
.main {
flex: auto; /* 1 1 auto, 自动放大，自动缩小*/
background: yellow;
}
</style>
</head>
<body>
<div class="header">this is header</div>
<div id="section">
<div class="main">
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
<h1>this is main</h1>
</div>
<div class="left">this is left</div>
<div class="right">this is right</div>
</div>
<div class="footer">this is footer</div>
</body>
</html>
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this is header
this is main
this is main
this is main
this is left
this is right
# margin负边距实现
缺点: 宽度过窄布局会崩塌,可以缩小屏幕试一下下面的demo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.clearfix:after {
content: " ";
display: block;
visibility: hidden;
clear: both;
height: 0;
font-size: 0;
}
.header,
.footer {
height: 50px;
}
.header {
background: fuchsia;
}
.footer {
background: blueviolet;
}
.container {
overflow: hidden;
}
.main-wrap,
.left,
.right {
float: left;
}
.main-wrap {
width: 100%;// 撑满，让left,right换行，再通过负边距拉回适当的位置
}
.main {
margin-left: 20%; // 腾开位置给left
margin-right: 25%; // 腾开位置给right
background: purple;
}
.left {
width: 20%;
background: red;
margin-left: -100%; // 拉回最左边
}
.right {
width: 25%;
background: green;
margin-left: -25%; // 拉回右边
}
</style>
</head>
<body>
<div class="header">这是header</div>
<div class="container">
<div class="main-wrap">
<div class="main">
这是主区域
</div>
</div>
<div class="left">这是left</div>
<div class="right">这是right</div>
</div>
<div class="footer">这是footer</div>
</body>
</html>
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这是header 这是header
这是主区域
这是主区域
这是left
这是right