jQuery实现自动播放功能的完整实例

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>auto play</title>
<script type="text/javascript" src="../jquery-1.8.0.min.js" /></script>
<script type="text/javascript">
//数组的第一项为时长，其他项可自定义
data = [["3","a"],["2","b"],["3","c"],["2","d"],["1",""]];
$(document).ready(function(){
//设置触发事件
autoPlay.run = function(obj,num){
back(obj,num);
        }; 
autoPlay();
    }); 
function back(obj,num){
"#div_show").html(obj[num][1]);
    } 
function autoPlay(){
//初始化计数参数
if(autoPlay.num ==undefined)
autoPlay.num = 0;
//初始化时间点
if(autoPlay.timepoint ==undefined)
autoPlay.timepoint = new Date().getTime();
if(autoPlay.num<data.length){
//函数句柄，data 数组，autoPlay.num当前下标
autoPlay.run(data,autoPlay.num);
//按照元素时间长度播放数组
if(new Date().getTime()>autoPlay.timepoint){
//判断是否为第一次执行
if(autoPlay.first==undefined)
autoPlay.first = true;
else
autoPlay.num++;
//设置下一次播放的时间点
autoPlay.timepoint += (data[autoPlay.num][0]*1000);
            } 
setTimeout("autoPlay()",500);
        } 
    } 
$.extend({autoPlay:function(){
var defaults = {inteval:500};
    }}); 
</script>
</head>
<body>
<div id="div_show"></div>
</body>
</html>

定义播放时间，可以定义事件