jquery实现倒计时小应用

<div id="shop_rec">  <ul class="cf">    <li>      <img src="image/goods.jpg" alt="小米 Note 顶配版" />      <div>        <h5>小米 Note 顶配版</h5>        <p>全网通 香槟金 移动联通<br />双4G手机 双卡双待</p>        <em>¥2998<i>起</i></em>        <span class="time" data-starttime="1445982375" data-endtime="1446350400"></span>      </div>    </li>    <li>      <img src="image/goods.jpg" alt="小米 Note 顶配版" />      <div>        <h5>小米 Note 顶配版</h5>        <p>全网通 香槟金 移动联通<br />双4G手机 双卡双待</p>        <em>¥2998<i>起</i></em>        <span class="time" data-starttime="1445912375" data-endtime="1436350400"></span>      </div>    </li>  </ul></div>

$(function(){  var abj = $("#shop_rec"),    timeObj = abj.find('.time');  var starttime = timeObj.data('starttime');  // 定时器函数  function actionDo(){    return setInterval(function(){      timeObj.each(function(index, el) {        var t = $(this),          surplusTime = t.data('endtime') -starttime;        if (surplusTime <= 0) {          t.html("活动已经开始");        } else{          var year = surplusTime/(24*60*60*365),            showYear = parseInt(year),            month = (year-showYear)*12,            showMonth = parseInt(month),            day = (month-showMonth)*30,            showDay = parseInt(day),            hour = (day-showDay)*24,            showHour = parseInt(hour),            minute = (hour-showHour)*60,            showMinute = parseInt(minute),            seconds = (minute-showMinute)*60,            showSeconds = parseInt(seconds);          t.html("");          if (showYear>0) {            t.append("<span>"+showYear+"年</span>")          };          if (showMonth>0) {            t.append("<span>"+showMonth+"月</span>")          };          if (showDay>0) {            t.append("<span>"+showDay+"天</span>")          };          if (showHour>=0) {            t.append("<span>"+showHour+"小时</span>")          };          if (showMinute>=0) {            t.append("<span>"+showMinute+"分钟</span>")          };          if (showSeconds>=0) {            t.append("<span>"+showSeconds+"秒</span>")          };        };      });      starttime++;    },1000); // 设定执行或延时时间  };  // 执行它  actionDo();});