js对象施用之团购时间倒计时

js对象应用之团购时间倒计时
最近在帮一个朋友在shopex485上做一个团购的功能，前台的团购商品倒计时，因为团购的商品可能是多个，各个商品的结束时间也不一定是相同的。所以就有必要做个对象来给各个商品。折腾了一个晚上，终于新鲜出炉了。在js对象里使用setTimeout还是有点学问的。

<script type="text/javascript">//服务器时间var service_time=<?php echo $now_time; ?>; function showTime(tuanid,time_distance){this.tuanid = tuanid;        //PHP时间是秒，JS时间是微秒this.time_distance = time_distance*1000;}showTime.prototype.setTimeShow=function(){var timer = $('lefttime_'+this.tuanid);    var str_time;    var int_day,int_hour,int_minute,int_second;      time_distance = this.time_distance;    this.time_distance = this.time_distance-1000;    if(time_distance>0){          int_day=Math.floor(time_distance/86400000);                 time_distance-=int_day*86400000;                 int_hour=Math.floor(time_distance/3600000);                 time_distance-=int_hour*3600000;             int_minute=Math.floor(time_distance/60000);             time_distance-=int_minute*60000;             int_second=Math.floor(time_distance/1000);              if(int_hour<10)                 int_hour="0"+int_hour;             if(int_minute<10)                 int_minute="0"+int_minute;             if(int_second<10)                 int_second="0"+int_second;             str_time=int_day+"天"+int_hour+"小时"+int_minute+"分钟"+int_second+"秒";        timer.innerHTML = str_time;          var self=this;        setTimeout(function(){self.setTimeShow();},1000);//D:正确    }else{                 timer.innerHTML ='团购结束';         return;        }}</script>