js实现网页同时进行多个倒计时功能

/**
*startime 应该是毫秒数
*/
 
var Alarm = function (startime, endtime, countFunc, endFunc) {
 this.time = Math.floor((endtime - startime) / 1000); //时间
 this.countFunc = countFunc; //计时函数
 this.endFunc = endFunc; //结束函数
 this.flag = 't' + Date.parse(new Date()); //
 };
Alarm.prototype.start = function () {
 var self = this;
 
 self.flag = setInterval(function () {
 if (self.time < 0) {
 clearInterval(self.flag);
 self.endFunc();
 console.log('计时结束');
 } else {
 var minute, hour, day, second;
 day = Math.floor(self.time / 60 / 60 / 24) < 10 ? '0' + Math.floor(self.time / 60 / 60 / 24) : Math.floor(self.time / 60 / 60 / 24);
 hour = Math.floor(self.time / 60 / 60 % 24) < 10 ? '0' + Math.floor(self.time / 60 / 60 % 24) : Math.floor(self.time / 60 / 60 % 24);
 minute = Math.floor(self.time / 60 % 60) < 10 ? '0' + Math.floor(self.time / 60 % 60) : Math.floor(self.time / 60 % 60);
 second = Math.floor(self.time % 60) < 10 ? '0' + Math.floor(self.time % 60) : Math.floor(self.time % 60);
 //倒计时执行函数
 self.countFunc(second, minute, hour, day);
 self.time--;
 }
 }, 1000);
}

var time1 = new Alarm(startime, endtime, countFunc, endFunc);
time1.start();
 
var time2 = new Alarm(startime, endtime, countFunc, endFunc);
time2.start();
...

var countTime = function () {
 var eles = $('.count_time'),
 len = eles.length;
 for (; len > 0; len--) {
 var ele = eles.eq(len - 1);
 (function (ele) {
 startTime = new Date(ele.attr('data-start-time')).getTime(),
 endTime = new Date(ele.attr('data-end-time')).getTime(),
 alarm = new Alarm(startTime, endTime, function (second, minute, hour, day) { //计时钟
 ele.text(hour + ':' + minute + ':' + second);
 }, function () { //倒计时结束
 ele.text('00:00:00');
 window.location.reload();
 });
 alarm.start();
 })(ele);
 }
};
countTime();