【1】float + calc
通过calc()函数计算出.middle元素的高度，并设置子元素高度为100%
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<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.middle{
overflow: hidden;
height: calc(100% - 100px);}.left{
float: left;
width: 100px;
margin-right: 20px;
height: 100%;}.right{
overflow: auto;
height: 100%;}.right-in{
height: 1000px;}.top,.bottom{height:50px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
【2】float + absolute + (fix)
通过增加结构来提高兼容性，.middle元素设置100%的高度，.top和.bottom设置absolute覆盖在.middle上
<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.top,.bottom{
position: absolute;
height:50px;
left: 0;
right: 0;}.top{top: 0;}.bottom{bottom: 0;}.middleWrap{
height: 100%;
overflow: hidden;}.middle{
overflow: hidden;
height: 100%;
margin: 50px 0;}.left{
float: left;
width: 100px;
margin-right: 20px;
height: 100%;}.right{
overflow: auto;
height: 100%;}.right-in{
height: 1000px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middleWrap">
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
【1】inline-block + calc
<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.middle{
height: calc(100% - 100px);
font-size: 0;}.left,.right{
display: inline-block;
vertical-align: top;
font-size: 16px;}.left{
width: 100px;
margin-right: 20px;
height: 100%;}.right{
width: calc(100% - 120px);
height: 100%;
overflow: auto;}.right-in{
height: 1000px;}.top,.bottom{height: 50px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
【2】inline-block + absolute + (fix)
<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.top,.bottom{
position: absolute;
left: 0;
right: 0;
height: 50px;}.top{top: 0;}.bottom{bottom: 0;}.middleWrap{
height: 100%;
font-size: 0;
overflow: hidden;}.middle{
position: relative;
height: 100%;
margin: 50px 0;
overflow: hidden;}.left,.rightWrap{
display: inline-block;
vertical-align: top;
font-size: 16px;}.left{
position: absolute;
width: 100px;
margin-right: 20px;
height: 100%;}.rightWrap{
width: 100%;
height: 100%;}.right{
height: 100%;
margin-left: 120px;
overflow: auto;}.right-in{
height: 1000px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middleWrap">
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="rightWrap">
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
水平方向子元素的间距可以用border实现。所有浏览器都不支持给table-cell元素设置overflow属性。firefox和IE11浏览器不支持给table-cell元素的设置100%高度的子元素设置overflow属性
<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.top,.bottom{
position: absolute;
width: 100%;
height: 50px;}.bottom{bottom: 0;}.middleWrap{
height: 100%;
overflow: hidden;}.middle{
width: 100%;
height: 100%;
display: table;
margin: 50px 0;
table-layout: fixed;}.left{
display: table-cell;
width: 120px;
border-right: 20px solid lightgray;}.rightWrap{
display: table-cell;
height: 100%;}.right{
height: 100%;
overflow: auto;}.right-in{
height: 1000px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middleWrap">
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="rightWrap">
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.top,.middle,.bottom{
position: absolute;
left: 0;
right: 0;}.top{
top: 0;
height: 50px;}.bottom{
bottom: 0;
height: 50px;}.middle{
top: 50px;
bottom: 50px;}.left,.right{
position: absolute;
top: 0;
bottom: 0;}.left{
width:100px;}.right{
left: 120px;
right: 0;
overflow: auto;}.right-in{
height: 1000px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
flex常用于小范围的布局，使用全屏布局时会因为性能问题，出现卡顿现象。如果要使用全屏自适应布局，则只有flex才能达到效果
<style>body,p{margin: 0;}body,html,.parent{height: 100%;}.parent{
display: flex;
flex-direction: column;}.top,.bottom{
height: 50px;}.middle{
display: flex;
flex: 1;}.left{
width: 100px;
margin-right: 20px;}.right{
flex: 1;
overflow: auto;}.right-in{
height: 1000px;}</style>
<div class="parent" id="parent" >
<div class="top" >
<p>top</p>
</div>
<div class="middle" >
<div class="left" >
<p>left</p>
</div>
<div class="right" >
<div class="right-in">
<p>right</p>
</div>
</div>
</div>
<div class="bottom" >
<p>bottom</p>
</div> </div>
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