前端ABC不使用float实现两边固定，中间自动扩展的布局
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>不使用float实现两边固定，中间自动扩展的布局</title>
<style>
.header{height:200px;background-color:red}
.main{position:relative;zoom:1;}
.main-left{position:absolute;left:0;top:0;width:300px;height:500px;background-color: yellow}
.main-right{position:absolute;right:0;top:0;width:300px;height:500px;background-color: green}
.main-center{height:500px;margin:0 300px;background-color: #aaaaaa}
.footer{height:100px;background-color: #dddddd}
</style>
</head>
<body>
<div class="header"></div>
<div class="main">
<div class="main-left">我是左侧我是左侧我是左侧我是左侧我是左侧我是左侧</div>
<div class="main-center">我是中间我是中间我是中间我是中间我是中间我是中间</div>
<div class="main-right">我是右侧我是右侧我是右侧我是右侧我是右侧我是右侧</div>
</div>
<div class="footer"></div>
</body>
</html>
负边距的”左边固定宽，右边自适应宽”。
<!DOCTYPE html>
<html>
<head>
<style>
*{margin:0px;padding:0px;}
#head{
min-height:50px;
width:100%;
background-color: yellow;
}
#container {
width:100%;
float:right;
margin-left:-200px;
}
#left{
width:200px;
height:200px;
float:left;
background-color: cyan;
}
#right{
height:200px;
margin-left:200px;
background-color: red;
}
#right div{
width:300px;
background-color: green;
clear:both;
}
#footer{
min-height:50px;
width:100%;
background-color: blue;
clear: both;
}
</style>
</head>
<body>
<div id="head"><h1>Header</h1></div>
<div id="left"><h1>Left Sidebar</h1></div>
<div id="container">
<div id="right"><div><h1>Content</h1></div></div>
</div>
<div id="footer"><h1>Footer</h1></div>
</body>
</html>
CSS3中的box-flex 一侧定宽 自适应
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>box</title>
<style type="text/css">
body,div{
margin: 0;
padding: 0;
}
.box{
background-color: green;
display: -moz-box;
display: -webkit-box;
display: box;
width: 100%;
}
.item:first-child{
width: 200px;
height: 80px;
margin:10px;
background-color: yellow;
}
.item:nth-child(2){
background-color: red;
height: 80px;
-moz-box-flex: 1;
-webkit-box-flex: 1;
box-flex: 1;
margin: 10px 0;
}
.item:last-child{
background-color: orange;
height: 80px;
-moz-box-flex: 1;
-webkit-box-flex: 1;
box-flex: 1;
margin:10px;
}
/*这里貌似如果.box设置了左右padding，分配宽度的时候不会减掉左右padding的部分，相当于忽略了padding效果*/
</style>
</head>
<body>
<div class="box">
<div class="item">column 1</div>
<div class="item">column 2</div>
<div class="item">column 3</div>
</div>
</body>
</html>