JavaScript Countdown class

(function (){    varJtimer =function() {        //Init        if(Arguments.length >= 1) {             This. Setendtime (Arguments[0]); }        if(Arguments.length >= 2) {             This. Setgeneratecallback (arguments[1]);    }    }; Jtimer.prototype.setEndTime=function () {        if(Arguments.length = = 1) {             This. EndTime = Arguments[0];//Date}} Jtimer.prototype.getMillisecond=function () {        return  This. Endtime.gettime ()-NewDate (). GetTime ();    }; Jtimer.prototype.setGenerateCallBack=function(callback) {if(typeofcallback = = "undefined")return;  This. Generatecallback =callback; } jtimer.prototype.generate=function () {        if(typeof  This. Generatecallback = = "undefined")return; varms = This. Getmillisecond ();  This. Generatecallback (Math.floor (MSMath.floor (ms/(1000*60*60))%, Math.floor (ms/(1000*60))% of 60, the Math.floor (ms/1000)% 60        );    }; Jtimer.prototype.start=function () {        varDelay = 1000; if(Arguments.length = = 1) {Delay= Arguments[0]; } _this= This;//For closure         This. Interval =Window.setinterval (function() {_this.generate ();    }, delay); } jtimer.prototype.stop=function () {        if(typeof  This. Interval = = "undefined")return; Window.clearinterval ( This. Interval);  This. Interval =undefined; } Window.jtimer=Jtimer;}) ();varJT =NewJtimer (NewDate ("6/27/2016"),function(day, Hour, Min, sec) {Console.log ( day+ "," + Hour + "," + min + "," +( sec);}); Jt.start (1000);

JavaScript Countdown class