选项卡

 1 <script>
 2     var obg=document.getElementsByTagName(‘h3‘);
 3     var cont=document.getElementsByTagName(‘ul‘);
 4 
 5     function change(num){
 6         for(var i=0;i<obg.length;i++){
 7             if(num==i){
 8                 cont[num].style.display=‘block‘;
 9 
10                 obg[num].style.background=‘pink‘;
11             }else{
12                 cont[i].style.display=‘none‘;
13 
14                 obg[i].style.background=‘#ccc‘;
15             }
16         }
17     }
18 </script>