JS Simple countdown (code optimization)

Countdown online A lot, so there is nothing to say, support: 1. Years, months, days, days, hours, minutes, minutes, etc. countdown.

The JS code is as follows:

/** JS Simple countdown * @param {date,obj} Date Object Format*/ functionCountdown (date,obj) {varSelf = This; Self.date=date; Self.obj=obj; Self._init (); }; $.extend (countdown.prototype,{_init:function(){        varSelf = This, obj=Self.obj; varDateTime =Self._calculatetime (); if(OBJ.SEC) {$ (obj.sec). HTML (DATETIME.SEC); }        if(Obj.mini) {$ (Obj.mini). HTML (Datetime.mini); }        if(Obj.hour) {$ (obj.hour). HTML (datetime.hour); }        if(Obj.day) {$ (obj.day). HTML (datetime.day); }        if(Obj.month) {$ (obj.month). HTML (datetime.month); }        if(obj.year) {$ (obj.year). HTML (datetime.year); }        //SetInterval will have an error of about 5 seconds per hour, so use settimeout to make the timer more accurate .T &&cleartimeout (t); vart = setTimeout (function() {self._init (); }, 1000); }, _zero:function(n) {varn = parseint (n,10); if(N > 0) {            if(N < 10) {n= "0" +N; }            returnString (n); }Else {            returnn = "00"; }}, _calculatetime:function(){        varSelf = This, Date= Self.date | | DATE.UTC (2050, 0, 1); varEnd =NewDate (date), now=NewDate (); //the getTimezoneOffset () method returns the difference between GMT and local time, measured in minutes.         varLefttime = Math.Round ((End.gettime ()-Now.gettime ())/1000) + end.gettimezoneoffset () * 60;varobj ={sec:"00", Mini:"00", hour:"00", Day:"00", Month:"00", Year:"0"        }; if(Lefttime > 0) {obj.sec= Self._zero (lefttime% 60); Obj.mini= Math.floor (LEFTTIME/60) > 0? Self._zero (Math.floor (LEFTTIME/60)% 60): "00"; Obj.hour= Math.floor (lefttime/3600) > 0?            Self._zero (Math.floor (lefttime/3600)% 24): "00"; Obj.day = Math.floor (Lefttime/(3600)) > 0? Self._zero (Math.floor (Lefttime/(24*3600))% 30): "00"; Obj.month= Math.floor (Lefttime/(* 3600)) > 0? Self._zero (Math.floor (Lefttime/(30 * 24 * 3600))% 12): "00"; //year, by the 360-day second of the regression yearObj.year = Math.floor (Lefttime/(* 3600)) > 0? Math.floor (Lefttime/(360 * 30 * 24 * 3600)): "0"; }        returnobj; } });

If the HTML is as follows:

<class= "Hour"></span><   class= "Mini"></span><   class= "SEC"></span> sec

So we can initialize the code like this:

var d = 1419509471000;     // var d = DATE.UTC (2030, 6, +, +); var obj = {    sec: $ (". Sec"),    Mini: $(". Mini"),     Hour: $ (". Hour") )}new countdown (d, obj);

Jsfiddler Countdown Demo