<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
ul{ width:328px;}
li{ width:100px; height:100px; border:1px #000 solid; float:left; margin-left:5px; list-style:none;}
.active{ background:red;}
</style>
<script src="jquery-1.11.1.js"></script>
<script>
$(function(){
var iNow = 0; $('input').click(function(){
var step = parseInt(Math.random() * 20 + 5);
var timer = setInterval(function(){
$('li').attr('class','');
$('li').eq(iNow).attr('class','active');
iNow++;
step--;
if(step==0){
clearInterval(timer);
alert( '您抽到了:' + $('li[class=active]').html() );
}
if(iNow == $('li').length){
iNow = 0;
}
},100);
});
});
</script>
</head>
<body>
<input type="button" value="抽奖">
<ul>
<li>1等奖</li>
<li>2等奖</li>
<li>3等奖</li>
<li>4等奖</li>
<li>5等奖</li>
<li>6等奖</li>
<li>7等奖</li>
<li>8等奖</li>
<li>9等奖</li>
</ul>
</body>
</html>