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Correction status：qualified
Teacher's comments：
Collection
Collection
三列布局双飞翼：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>三列布局双飞翼</title>
<style>
.head,.foot{
width: 100%;
height: 60px;
background-color: lightgray;
}
.box{
width: 1000px;
height: 100%;
background-color: gray;
margin: auto;
text-align: center;
line-height: 60px;
}
.content{
width: 1000px;
height: 100%;
background-color: palegoldenrod;
margin:0 auto;
overflow: hidden;/*内容溢出隐藏*/
}
.content .main{
width: 100%;
height: 650px;
background-color: sandybrown;
float: left;
}
.left{
width: 200px;
height: 650px;
background-color: lightcoral;
float: left;
margin-left: -1000px;
}
.main .middle{
width: 100%;
height: 650px;
background-color: rebeccapurple;
margin: 0 200px;
}
.right{
width: 200px;
height: 650px;
background-color: lightskyblue;
float: left;
margin-left: -200px;
}
</style>
</head>
<body>
<div class="head">
<div class="box">网站头部</div>
</div>
<div class="content">
<div class="main">
<!--双飞翼这里要包一层，因为用到了外边距，盒子会被撑大-->
<div class="middle">中间</div>
</div>
<div class="left">左边</div>
<div class="right">右边</div>
</div>
<div class="foot">
<div class="box">网站底部</div></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
三列布局圣杯：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>三列布局圣杯</title>
<style>
.head,.foot{
width: 100%;
height: 60px;
background-color: lightgray;
}
.box{
width: 1000px;
height: 100%;
background-color: gray;
margin: auto;
text-align: center;
line-height: 60px;
}
.content{
width: 600px;
height: 650px;
background-color: lightgray;
margin: auto;
padding: 0 200px;
}
.content .main{
width: 100%;
height: 650px;
background-color: sandybrown;
float: left;
}
.left{
width: 200px;
height: 650px;
background-color: lightskyblue;
float: left;
margin-left: -100%;
position: relative;
left: -200px;
}
.right{
width: 200px;
height: 650px;
background-color: rebeccapurple;
float: left;
margin-left: -200px;
position: relative;
right: -200px;
}
</style>
</head>
<body>
<div class="head">
<div class="box">网站头部</div>
</div>
<div class="content">
<div class="main">中间</div>
<div class="left">左边</div>
<div class="right">右边</div>
</div>
<div class="foot">
<div class="box">网站底部</div></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
总结：
三列双飞翼布局：
布局分头，主体，尾部三个部分
DOM操作一定要将主体的中间部分放在最前面，让它浮动，占满宽度100%
让左右浮动 左边margin=-100%,右边margin=-右边宽度 ，再使用中间部分margin撑开两边宽度即可
块中使用了margin，必须给其套一层，否则margin会撑破块级元素
手抄三列布局双飞翼：
运行效果图：
