斗鱼的sidebar的实现简陋的demo

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8" />
<title></title>
<style>
.sidebar{
position:fixed;
top:0;
left:0;
background:#f00;
}
.content{
200px;
background:#666;
height:200px;
}
.left-smcontent{
57px;
display:none;
background:#ccc;
height:200px;
}
.small .content{ display:none;}
.small .left-smcontent{ display:block;}
.small .close{left:57px;}
.close{
position:fixed;
top:50%;
left:200px;
display:inline-block;
30px;
height:30px;
background:red;
}
.main{margin-left:250px;}
</style>
</head>
<body>
<div id="sidebar" class="sidebar">
<div class="content"></div>
<div class="left-smcontent"></div>
<a href="javascript:;" id="close" class="close"></a>
</div>
<div class="main" id="main">2222222</div>
  <script>
function $(id){
return document.getElementById(id)
         }
function windowHight(){
return document.documentElement.clientHeight||document.body.clientHeight;
         }
$("sidebar").style.height=windowHight()+"px";
window.onresize=function(){
$("sidebar").style.height=windowHight()+"px";
         }
$("close").onclick=function(){
if($("sidebar").className=="sidebar small"){
$("sidebar").className="sidebar";
$("main").style.marginLeft="250px"
}else{
$("sidebar").className="sidebar small";
$("main").style.marginLeft="57px"
}
         }
</script></body>
</html>

//因为时间比较紧张，没有对源码进行详细的介绍，在周末的优化的时候都会一一的补上，并且对代码进行优化








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