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下面的例子是一个简单的布局
最上面是header，左边是一个logo（老男孩），右边是用户的登录信息
中间一大块是内容，内容左侧是菜单，右侧是具体的内容
代码如下：
body的margin为0，确保边上全部填满
absolute 确保位置不变; 注意如果他的父级标签有relative，他相对于这个父级标签的位置不变，否则相对于body的位置不变
overflow 在内容超过标签范围之后会自动加个滚轮
font-awesome插件可以使用现成的小标签
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="font-awesome-4.7.0/css/font-awesome.min.css"/>
<style>
body{
margin: 0;
}
.left{
float: left;
}
.right{
float: right;
}
.pg-header{
height: 48px;
background-color: #2459a2;
color: white;
line-height: 48px;
}
.pg-header .logo{
width: 200px;
background-color: #204982;
text-align: center;
}
.pg-header .icons{
padding: 0 20px;
}
.pg-header .icons:hover{
background-color: #204982;
}
.pg-header .user{
margin-right: 60px;
padding: 0 20px;
color: white;
height: 48px;
}
.pg-header .user:hover{
background-color: #204982;
}
.pg-header .user .a img{
height: 40px;width: 40px;margin-top: 4px;border-radius: 50%;
}
.pg-header .user .b{
z-index: 20;
position: absolute;
top: 48px;
right: 0;
background-color: white;
color: black;
width: 160px;
display: none;
font-size: 14px;
line-height: 30px;
}
.pg-header .user .b a{
padding: 5px;
color: black;
text-decoration: none;
}
.pg-header .user .b a:hover{
background-color: #dddddd;
}
.pg-header .user:hover .b{
display: block;
}
.pg-header .user .b a{
display: block;
}
.pg-content .menu{
position: absolute;
top:48px;
left: 0;
bottom: 0;
width: 200px;
background-color: #dddddd;
}
.pg-content .content{
position: absolute;
top: 48px;
right: 0;
bottom: 0;
left: 200px;
overflow: auto;
z-index: 9;
}
</style>
</head>
<body>
<div class="pg-header">
<div class="logo left">
老男孩
</div>
<div class="user right" >
<a class="a" href="#">
<img src="22.jpg">
</a>
<div class="b">
<a href="#">我的资料</a>
<a href="#">注销</a>
</div>
</div>
<div class="icons right">
<i class="fa fa-commenting-o" aria-hidden="true"></i>
<span>5 </span>
</div>
<div class="icons right">
<i class="fa fa-bell-o" aria-hidden="true"></i>
</div>
</div>
<div class="pg-content">
<div class="menu left">a</div>
<div class="content left">
<!--<div >返回顶部</div>-->
<!--<div >返回顶部</div>-->
<div >
<p >asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
<p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p><p>asdf</p>
</div>
</div>
</div>
<div class="pg-footer"></div>
</body>
</html>效果如下
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