圣杯布局与双飞翼布局 - 说中
圣杯布局和双飞翼布局的目的都是：左右两栏固定宽度，中间部分自适应；
圣杯布局
圣杯布局HTML：
<div class="wrap">
<div class="main">
我是主要
</div>
<div class="left">
我是左边
</div>
<div class="right">
我是右边
</div>
</div>
圣杯布局CSS:
* {
margin: 0;
padding: 0
}
.main {
background-color: yellow;
height: 100px;
float: left;
width: 100%;
}
.left {
background-color: red;
width: 200px;
height: 100px;
float: left;
margin-left: -100%; /*margin负边距*/
position: relative; /*相对自身偏移*/
left: -200px;
}
.right {
background-color: blue;
width: 200px;
height: 100px;
float: left;
margin-left: -200px; /*margin负边距*/
position: relative; /*相对自身偏移*/
right: -200px;
}
.wrap {
padding: 0 200px; /*父级设置padding*/
}圣杯布局的优点：
使主要内容列先加载。
允许任何列是最高的。
没有额外的div。
需要的hack很少。
双飞翼布局
双飞翼HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<title>
双飞翼布局
</title>
<link rel="stylesheet" href="main.css"/>
</head>
<body>
<div class="main-wrap"> <!-- 把main嵌套在一个div里面 -->
<div class="main">
我是主要
</div>
</div>
<div class="left">
我是左边
</div>
<div class="right">
我是右边
</div>
</body>
</html>
双飞翼CSS
.main-wrap {
float: left;
width: 100%;
}
.main {
height: 100px;
margin-left: 200px; /*利用左、右外边距定位*/
margin-right: 200px;
background-color: yellow;
}
.left {
background-color: red;
width: 200px;
height: 100px;
float: left;
margin-left: -100%;
}
.right {
background-color: blue;
width: 200px;
height: 100px;
float: left;
margin-left: -200px;
}圣杯布局和双飞翼的比较：
1.两种布局都是把主要内容放在前面加载；
2.布局有相似之处，都使用了负外边距来布局；
3.不同：
圣杯布局是设置 父容器的padding值、相对定位来实现；
双飞翼布局是给main添加了一个div容器、设置main的左右外边距 来实现；
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