由上图可以看出，页面分为上(网站导航)、中、下(版权声明)三个部分，
中间部分又分为左(商品分类)、中(主要部分)、右，这些版块就像一个个
的盒子，这些"盒子"中放置着各种内容，页面就是由这些"盒子"拼凑起来
案例布局分析：
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>单列布局</title>
</head>
<style>
body{
margin:0;
}
.box{
width:960px;
margin:0 auto;
}
.box .header{
height:120px;
border:1px solid #f00;
line-height:120px;
}
.box .main{
height:300px;
border:1px solid #0f0;
line-height:300px;
}
.box .footer{
height:100px;
border:1px solid #00f;
line-height:100px;
}
p{
text-align:center;
}
</style>
<body>
<p class="box">
<p class="header">头部</p>
<p class="main">主题</p>
<p class="footer">底部</p>
</p>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>双列布局</title>
</head>
<style>
body{
margin:0;
}
.box{
width:80%;
margin:0 auto;
overflow:hidden;
}
.box .left{
width:30%;
height:400px;
background-color:#0f0;
float:left;
}
.box .right{
width:70%;
height:400px;
background-color:#f00;
float:left;
}
</style>
<body>
<p class="box">
<p class="left"></p>
<p class="right"></p>
</p>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>三列布局</title>
</head>
<style>
body{
margin:0;
}
.box{
width:960px;
margin:0 auto;
position:relative;
}
.box .left{
width:200px;
height:400px;
background-color:#0f0;
position:absolute;
}
.box .center{
height:400px;
background-color:#00f;
margin:0 300px 0 200px;
}
.box .right{
width:300px;
height:400px;
background-color:#f00;
position:absolute;
right:0;
top:0;
}
</style>
<body>
<p class="box">
<p class="left"></p>
<p class="center"></p>
<p class="right"></p>
</p>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>混合布局</title>
</head>
<style>
body{
margin:0;
}
.box{
width:960px;
margin:0 auto;
}
.header{
height:120px;
background-color:#ddd;
}
.main{
height:400px;
background-color:#f00;
position:relative;
}
.main .left{
width:200px;
height:400px;
position:absolute;
left:0;
top:0;
background-color:#0fccaa;
}
.main .center{
height:400px;
margin:0 305px 0 205px;
background-color:#123456;
}
.main .right{
width:300px;
height:400px;
position:absolute;
right:0;
top:0;
background-color:#ff0;
}
.footer{
height:80px;
background-color:#ddd;
}
</style>
<body>
<p class="box">
<p class="header"></p>
<p class="main">
<p class="left"></p>
<p class="center"></p>
<p class="right"></p>
</p>
<p class="footer"></p>
</p>
</body>
</html>
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