JS/jquery实现一个网页内同时调用多个倒计时的方法

var plugJs={  stamp:0,  tid:1,  stampnow:'<?php echo NOW_TIME;?>',//统一开始时间戳  intervalTime:function(){    if(plugJs.stamp > 0){      var day = Math.floor(plugJs.stamp / (60 * 60 * 24));      var hour = Math.floor(plugJs.stamp / (60 * 60)) - (day * 24);      var minute = Math.floor(plugJs.stamp / 60) - (day * 24 * 60) - (hour * 60);      var second = Math.floor(plugJs.stamp) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);      if (day <= 9) day = '0' + day;      if (hour <= 9) hour = '0' + hour;      if (minute <= 9) minute = '0' + minute;      if (second <= 9) second = '0' + second;      jQuery('.t_h_'+plugJs.tid).html(hour);      jQuery('.t_m_'+plugJs.tid).html(minute);      jQuery('.t_s_'+plugJs.tid).html(second);      plugJs.stamp--;      setTimeout('if(typeof(plugJs.intervalTime) == "function"){plugJs.intervalTime();}',1000);    }  },  timer:function (stampend,tid){    plugJs.stamp = parseInt(stampend)-parseInt(plugJs.stampnow);//剩余时间戳    setTimeout('if(typeof(plugJs.intervalTime) == "function"){plugJs.intervalTime();}',1000);  }};jQuery(document).ready(function(){  var stampend = parseInt(jQuery('.countdown_1').attr('data-time'));//灵活读取表里的结束时间戳  plugJs.timer(stampend,'1');});

<div class="time countdown_1" data-time="1449429731">  <span class="t_h_1">00</span>  <i class="lay_line">:</i>  <span class="t_m_1">00</span>  <i class="lay_line">:</i>  <span class="t_s_1">00</span></div><div class="time countdown_2" data-time="1449456731">  <span class="t_h_2">00</span>  <i class="lay_line">:</i>  <span class="t_m_2">00</span>  <i class="lay_line">:</i>  <span class="t_s_2">00</span></div>