1、左侧固定宽高，右侧自适应占满
<div class="box"> <div class="left"></div> <div class="right"></div> </div>
style样式
*{
margin:0;
padding:0;
}
.box{
height:500px;
background:yellow;
}
.left{
float:left;
width:200px;
height:100%;
background:red;
}
.right{
width-left:200px;
height:100%;
background:green;
}
2、左右固定宽高，中间自适应占满
<div class="box"> <div class="left"></div> <div class="right"></div> <div class="center"></div> </div>
style样式
*{
margin:0;
padding:0;
}
.box{
height:500px;
background:yellow;
}
.left{
float:left;
width:200px;
height:100%;
background:red;
}
*{
margin:0;
padding:0;
}
.box{
height:500px;
background:yellow;
}
.left{
float:left;
width:200px;
height:100%;
background:red;
}
.center{
height:500px:
background:blue;
}
.right{
width:200px;
height:100%；
float:right；
background:green;
}
原文：https://www.cnblogs.com/gjm960406/p/10146532.html