1 <!doctype html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>Document</title>
6 <style>
7 *{margin: 0;padding: 0;}
8 #tab{width: 410px;margin: 0 auto;}
9 #tit{overflow: hidden;}
10 #tit span{float: left;width: 100px;height: 30px;border: 1px solid red;text-align: center;line-height: 30px;font-size: 30px;}
11 #con{width: 406px;border: 1px solid red;list-style: none;height: 300px;}
12 #con li{width: 406px;height: 300px;text-align: center;line-height: 300px;font-size: 50px;color: red;display: none;}
13 #con .show{display: block;}
14 #tit .select{background: #ccc;}
15 </style>
16 </head>
17 <body>
18 <div id="tab">
19 <div id="tit">
20 <span class='select' >111</span>
21 <span >222</span>
22 <span >333</span>
23 <span >444</span>
24 </div>
25 <ul id="con">
26 <li class="show" >内容1111</li>
27 <li>内容2222</li>
28 <li>内容3333</li>
29 <li>内容4444</li>
30 </ul>
31 </div>
32
33 <script>
34 var tit=document.getElementById('tit');
35 var spans=tit.getElementsByTagName('span');
36 var con=document.getElementById('con');
37 var lis=con.getElementsByTagName('li');
38 /*spans[0].abc=0;
39 spans[1].abc=1;
40 spans[2].abc=2;
41 spans[3].abc=3;*/ //给所有span扩充一个叫做abc的属性，abc的值就是span的下标值
42 for (var i = 0; i < spans.length; i++) {
43 //给所有span绑定一个点击事件，给所有的span一个index属性，index的值就是i也就是span的下标值
44 spans[i].index=i;
45 spans[i].onclick=function() {
46 for (var i = 0; i < spans.length; i++) {
47 spans[i].className='';
48 lis[i].className='';
49 };//清空所有的span以及li的类名
50 this.className='select';
51 //当前点击的span类名为select
52 // console.log(this.index);
53 lis[this.index].className='show';
54 //this.index指的是当前点击的span的下标值
55
56 };
57 };
58 </script>
59 </body>
60 </html>
