代码如下：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title></title> <style> *{margin:0;padding:0;} #container{width:310px;height:310px;margin:30px auto;} #ul1{width:310px;height:310px;list-style:none;} #ul1 li,#ul1 a{width:100px;height:100px;border:1px solid #565656;float:left;text-align:center;line-height:100px;} #ul1 a:hover{cursor:pointer;color:orange;font-size:18px;} #ul1 .active{background:red;color:#fff;} #pp{line-height:32px;color:#9a9a9a;text-align:center;} </style> </head> <body> <div> <ul> <li>一等奖</li> <li>二等奖</li> <li>三等奖</li> <li>四等奖</li> <a>开始</a> <li>五等奖</li> <li>六等奖</li> <li>七等奖</li> <li>八等奖</li> </ul> <p></p> </div> <script> var container = document.getElementById('container'), li = container.getElementsByTagName('li'), aa = container.getElementsByTagName('a')[0], pp = document.getElementById('pp'), timer = null; function start(){ var i = 0; var num = Math.floor(Math.random() * li.length) + 20; if(i<num){ timer = setInterval(function(){ for(var j=0;j<li.length;j++){ li[j].className = ''; } li[i%li.length].className = 'active'; i++; if(i === num){ clearInterval(timer); if(num%li.length === 0){ pp.innerHTML += "恭喜您中了：8 等奖" + '<br/>'; }else{ pp.innerHTML += "恭喜您中了："+ parseInt(num%li.length) + " 等奖"+ '<br/>'; } } },130); } } aa.onclick = function(){ start(); } </script> </body> </html>