1、通过绝对定位(position:absolute)，实现三列布局
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<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>使用绝对定位（position:absolute）实现三列布局</title>
<!-- <link rel="stylesheet" href="css/style3c.css">-->
<style>
.container{
width: 1000px;
margin: 0 auto;
}
.main{
position: relative;
background-color: lightblue;
margin: 5px auto;
}
.content{
min-height: 600px;
line-height: 600px;
text-align: center;
background-color: lightseagreen;
margin-left: 210px;
margin-right: 210px;
}
.header, .footer{
background-color: lightgrey;
height: 60px;
text-align: center;
line-height: 60px;
}
.left, .right{
width: 200px;
height: 600px;
line-height: 600px;
text-align: center;
}
.left{
background-color: lightgreen;
position: absolute;
top: 0;
left: 0;
}
.right{
background-color: lightcoral;
position: absolute;
top: 0;
right: 0;
}
</style>
</head>
<body>
<div class="container">
<div class="header">头部.header</div>
<div class="main">
<div class="left">左侧.left</div>
<div class="content">内容区.content</div>
<div class="right">右侧.right</div>
</div>
<div class="footer">底部.footer</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
2、通过浮动float，实现三列布局
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>通过浮动float，实现三列布局</title>
<!-- <link rel="stylesheet" href="css/style4c.css">-->
<style>
.container {
width: 1000px;
margin: 0 auto;
background-color: red;
}
.header, .footer {
height: 60px;
background-color: lightgrey;
}
.main {
background-color: black;
margin: 5px auto;
overflow: hidden;
}
.left, .right {
width: 200px;
height: 600px;
}
.left {
background-color: lightgreen;
float: left;
}
.right {
background-color: lightcoral;
float: right;
}
.content{
float: left;
width: 580px;
min-height: 600px;
margin-left: 10px;
background-color: lightseagreen;
}
</style>
</head>
<body>
<!--
使用浮动布局：
1、先将main下的（.left, .content, .right）全部float
2、通过对他们的父容器main使用overflow:hidden清除浮动
-->
<div class="container">
<div class="header">头部.footer</div>
<div class="main">
<div class="left">左侧栏.left</div>
<div class="content">内容区.content</div>
<div class="right">右侧栏.right</div>
</div>
<div class="footer">底部.footer</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
3. 完成双飞翼布局案例
待完成……
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