全屏布局

利用绝对定位实现

<div class="parent">
<div class="top">top</div>
<div class="left">left</div>
<div class="right">right</div>
<div class="bottom">bottom</div>
</div>
html,body,parent{height:100%;overflow:hidden;}
.top{position:absolute:top:0;left:0;right:0;height:100px;}
.left{position:absolute;top:100px;left:0;bottom:50px;width:200px;}
.right{position:absolute;overflow:auto;left:200px;right:0;top:100px;bottom:50px;}
.bottom{position:absolute;left:0;right:0;bottom:0;height:50px;}
利用flex实现

<div class="parent">
<div class="top">top</div>
<div class="middle">
<div class="left">left</div>
<div class="right">right</div>
</div>
<div class="bottom">bottom</div>
</div>
.parent{display:flex;flex-direction:column;}
.top{height:100px;}
.bottom{height:50px;}
.middle{flex:1;display:flex;}
.left{width:200px;}
.right{flex:1;overflow:auto;}