1 <title>左定宽,右自动</title>
2 <style>
3 body{margin:0px;padding:0px;}
4 .box .left,.box .right{
5 height:200px;line-height: 200px;text-align: center;
6 }
7 .box .left{
8 float:left;width:200px;background-color:red;
9 }
10 .box .right{
11 margin-left:210px;background-color: blue;
12 }
13 </style>
14 <body>
15 <div class="box">
16 <div class="left">左</div>
17 <div class="right">右</div>
18 </div>
19 </body>

aaarticlea/png;base64,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" alt="" />

 <title>左定宽,右自动(position+margin)</title>
<style>
body{margin:0px;padding:0px;}
.box .left,.box .right{
height:200px;line-height: 200px;text-align: center;
}
.box .left{
position: absolute;width:200px;background-color:red;
}
.box .right{
margin-left:210px;background-color: yellow;
}
</style>
<body>
<div class="box">
<div class="left">左</div>
<div class="right">右</div>
</div>
</body>

aaarticlea/png;base64,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" alt="" />

 <title>(两侧定宽,中间自适应)</title>
<style>
body{margin:0px;padding:0px;}
.center,.left,.right{
height:200px;line-height: 200px;text-align:center;
}
.left{
float:left;width:200px;background-color:red;
}
.right{
float:right;width:200px;background-color:yellow;
}
.center{
margin:0px 210px;background-color:blue;
}
</style>
<body>
<div class="left">左</div>
<div class="right">右</div>
<div class="center">中</div>
</body>

aaarticlea/png;base64,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" alt="" />

 <title>(两侧定宽,中间自适应)</title>
<style>
body{margin:0px;padding:0px;}
.center,.left,.right{
height:200px;line-height: 200px;text-align:center;
}
.left{
position:absolute;top:0px;left:0px;width:200px;background-color:red;
}
.right{
position:absolute;top:0px;right:0px;width:200px;background-color:yellow;
}
.center{
margin:0px 210px;background-color:blue;
}
</style>
<body>
<div class="left">左</div>
<div class="right">右</div>
<div class="center">中</div>
</body

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