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左列定宽，右列自适应
利用float+margin实现
.left{float:left;width:100px;}
.right{margin-left:100px;}
使用float+overflow实现
.left{width:100px;float:left;}
.right{overflow:hidden;}
实用flex实现
.parent{display:flex;}
.left{width:100px;}
.right{flex:1;}
经典圣杯布局
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>圣杯布局</title>
<style type="text/css">
*{
margin: 0;padding: 0;}
body{
min-width: 700px;}
h3{
padding:0 20px}
.header{
width: 100%;
height: 40px;
background-color: #646464;
}
.footer{
width: 100%;
height: 40px;
margin-top: 300px;
background-color: #646464;
}
.middle{
float: left;
width: 100%;
height: 300px;
text-align: center;
background-color: #ffd36a;
}
.left{
float:left;
width: 200px;
height: 300px;
margin-left: -100%;
background-color: #ff63bd;
}
.right{
float: left;
width: 200px;
height: 300px;
margin-left: -200px;
background-color: #a2ff95;
}
</style>
</head>
<body>
<div class="header">
<h3>header</h3>
</div>
<div class="middle">
<h3>middle</h3>
</div>
<div class="left">
<h3>left</h3>
</div>
<div class="right">
<h3>right</h3>
</div>
<div class="footer">
<h3>footer</h3>
</div>
</body>
</html>
两侧定宽，中栏自适应
利用float+margin实现
.left{width：100px;float:left;}
.center{float:left;width:100%;margin-right:-200px;}
.right{width:100px;float:right;}
利用flex实现
.parent{display:flex;}
.left{width:100px;}
.center{flex:1;}
.right{width:100px;}