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Correction status：Uncorrected
Teacher's comments：
Collection
Collection
用双飞翼实现三列布局：
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>双飞翼三列布局</title>
<style type="text/css">
.header,.footer{
width: 100%;
height:60px;
background-color: lightgray;
}
.content{
width: 1000px;
height: 60px;
background-color: gray;
margin: auto;
text-align: center;
line-height: 60px;
}
.container{
width: 1000px;
margin:auto;
border: 1px solid red;
background-color: yellow;
overflow: hidden;
}
.footer{
clear: both;
}
.wrap{
width: 100%;
float:left;
background-color: cyan;
}
.wrap .main{
height: 600px;
background-color: wheat;
margin-left: 200px;
margin-right: 200px;
}
.left{
width: 200px;
float:left;
height: 600px;
background-color: lightskyblue;
margin-left: -100%;
}
.right{
width: 200px;
float: left;
height: 600px;
background-color: lightskyblue;
margin-left: -200px;
}
</style>
</head>
<body>
<div class="header">
<div class="content">网站头部</div>
</div>
<div class="container">
<div class="wrap">
<div class="main">中部</div></div>
<div class="left">左部</div>
<div class="right">右部</div>
</div>
<div class="footer">
<div class="content">网站底部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
用圣杯实现三列布局：
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>双飞翼三列布局</title>
<style type="text/css">
.header,.footer{
width: 100%;
height:60px;
background-color: lightgray;
}
.content{
width: 1000px;
height: 60px;
background-color: gray;
margin: auto;
text-align: center;
line-height: 60px;
}
.footer{
clear: both;
}
.container{
border: 1px solid red;
width: 600px;
margin: auto;
padding: 0 200px;
overflow: hidden;
background-color: yellow;
}
.container .main{
width: 100%;
min-height: 650px;
float: left;
background-color: green;
}
.container .left{
width: 200px;
min-height: 650px;
float: left;
background-color: blue;
margin-left: -100%;
position: relative;
left: -200px;
}
.container .right{
width: 200px;
min-height: 650px;
float: left;
background-color: blue;
margin-left: -200px;
position: relative;
left: 200px;
}
background-color: green;
</style>
</head>
<body>
<div class="header">
<div class="content">网站头部</div>
</div>
<div class="container">
<div class="main">中部</div>
<div class="left">左部</div>
<div class="right">右部</div>
</div>
<div class="footer">
<div class="content">网站底部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
终结：
1，双飞翼是用margin-left与margin-right挤压实现三列布局。
2，圣杯是用padding后在用绝对定位让两个耳朵填充padding后实现三列布局。
3，两种方式都用到浮动，并且都用overflow：hidden让父元素包住子元素。