<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.tab-head div{
width: 80px;
height: 40px;
background-color: blue;
margin-left: 30px;
float: left;
}
/*.on代表选中的div*/
.tab-head div.on{
background-color: #E0FFFF;
}
.tab-body div{
width: 200px;
height: 100px;
background-color:wheat;
margin-left: 30px;
display: none;
}
.tab-body div.on{
/*使选中的div成块状显示出来*/
display: block;
}
</style>
</head>
<body>
<div class="tab-box">
<div class="tab-head">
<div id="t1" class="on" onclick="test(1)">1</div>
<div id="t2" onclick="test(2)">2</div>
</div>
<div class="tab-body">
<div id="k1" class="on">111</div>
<div id="k2">222</div>
</div>
</div>
<script type="text/javascript">
//使用函数的方法进行取值
function $(id){
return document.getElementById(id);
}
function test(num){
for(var i=1;i<=2;i++){
//清除class值
$("t"+i).className="";
$("k"+i).className="";
}
//设置新的class值
$("t"+num).className="on";
$("k"+num).className="on";
}
</script>
</body>
</html>
原文：https://www.cnblogs.com/weixin2623670713/p/12944228.html