<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>选项卡</title>
<style>
*{
margin:0;
padding: 0;
}
div{
300px;
height: 300px;
border: 1px solid red;
text-align: center;
line-height: 200px;
display: none;
}
#div1{
display: block;
}
button{
display: inline;
100px;
height: 20px;
margin-right: -4px;/*去掉多个按钮之间默认的间距*/
}
</style>
<script>
window.onload=function(){
var aInput=document.getElementsByTagName('button');
var oDiv=document.getElementsByTagName('div');
var n=0;
for(var i = 0;i < aInput.length;i++){
aInput[i].index=i;
aInput[i].onclick=function(){
aInput[n].style.background="";//先把下标为0的按钮背景颜色清空
oDiv[n].style.display="none";
this.style.background="red";//点击当前的按钮，给当前按钮一个红色背景
oDiv[this.index].style.display="block";
n=this.index;
}
}
}
</script>
</head>
<body>
<button style="background: red;"/>tab1</button>
<button>tab2</button>
<button>tab3</button>
<div id="div1">
我是tab1里的内容
</div>
<div>
我是tab2里的内容
</div>
<div>
我是tab3里的内容
</div>
</body>
</html>