jquery实现倒计时小应用

<div id="shop_rec">
 <ul class="cf">
 <li>
 <img src="image/goods.jpg" 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" 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();
});