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老师批语：通过这个案例,相信你对一些商业网站的布局有了自己的理解
使用双飞翼布局
<!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;
list-style: none;
}
header {
background: black;
}
header .content {
width: 90%;
margin: 0 auto;
background: black;
height: 60px;
overflow: hidden;
}
header .content .nav .item {}
header .content .nav .item a {
width: 100px;
height: 60px;
margin-right: 5px;
float: left;
text-align: center;
line-height: 60px;
color: white;
padding: 0 15px;
text-decoration: none;
}
header .content .nav .item a:hover {
background: white;
color: black;
}
footer {
background: black;
}
footer .content {
width: 90%;
height: 60px;
background: black;
margin: 0 auto;
}
footer .content p {
text-align: center;
line-height: 60px;
}
footer .content p a {
color: #a29e9e;
text-decoration: none;
}
footer .content p a:hover {
color: white;
}
.container {
/* min-height: 800px; */
background: skyblue;
width: 90%;
margin: 0 auto;
overflow: hidden;
}
.container .left {
width: 200px;
min-height: 800px;
background: yellow;
margin-left: -100%;
}
.container .right {
width: 200px;
min-height: 800px;
background: yellowgreen;
margin-left: -200px;
}
.container .warp {
width: 100%;
background: red;
}
.container .warp .main {
min-height: 800px;
padding: 0 200px;
}
.warp,
.left,
.right {
float: left;
}
</style>
</head>
<body>
<header>
<div class="content">
<ul class="nav">
<li class="item"><a href="">首页</a></li>
<li class="item"><a href="">经典案例</a></li>
<li class="item"><a href="">经典案例</a></li>
<li class="item"><a href="">经典案例</a></li>
<li class="item"><a href="">经典案例</a></li>
</ul>
</div>
</header>
<div class="container">
<div class="warp">
<div class="main">
<h1>主题</h1>
</div>
</div>
<div class="left">左侧</div>
<div class="right">右侧</div>
</div>
<footer>
<div class="content">
<p><a href="">© php中文网版权所有</a> | <a href="">© php中文网版权所有</a> | <a href="">© php中文网版权所有</a></p>
</div>
</footer>
</body>
</html>点击 "运行实例" 按钮查看在线实例
总结：通过浮动和负外边距完成经典的双飞翼布局。左侧和右侧是固定宽度，中间的需要宽度分离并且要设置左右边距是左右盒子的宽度，让内容正常展示。
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