codice:
<script type="text/javascript">var CDown = function() {
this.state=0;// if initialized
this.counts=[];// array holding countdown date objects and id to print to {d:new Date(2013,11,18,18,54,36), id:"countbox1"}
this.interval=null;// setInterval object
}
CDown.prototype = {
init: function(){
this.state=1;
var self=this;
this.interval=window.setInterval(function(){self.tick();}, 1000);
},
add: function(date,id){
this.counts.push({d:date,id:id});
this.tick();
if(this.state==0) this.init();
},
expire: function(idxs){
for(var x in idxs) {
this.display(this.counts[idxs[x]], "Now!");
this.counts.splice(idxs[x], 1);
}
},
format: function(r){
var pre='',post='',divide=', ',
out="";
if(r.d != 0){out += pre+r.d +" "+((r.d==1)?"day":"days")+post+divide;}
if(r.h != 0){out += pre+r.h +" "+((r.h==1)?"hour":"hours")+post+divide;}
out += pre+r.m +" "+((r.m==1)?"min":"mins")+post+divide;
out += pre+r.s +" "+((r.s==1)?"sec":"secs")+post+divide;
return out.substr(0,out.length-divide.length);
},
math: function(work){
var y=w=d=h=m=s=ms=0;
ms=(""+((work%1000)+1000)).substr(1,3);
work=Math.floor(work/1000);//kill the "milliseconds" so just secs
y=Math.floor(work/31536000);//years (no leapyear support)
w=Math.floor(work/604800);//weeks
d=Math.floor(work/86400);//days
work=work%86400;
h=Math.floor(work/3600);//hours
work=work%3600;
m=Math.floor(work/60);//minutes
work=work%60;
s=Math.floor(work);//seconds
return {y:y,w:w,d:d,h:h,m:m,s:s,ms:ms};
},
tick: function(){
var now=(new Date()).getTime(),
expired=[],cnt=0,amount=0;
if(this.counts)
for(var idx=0,n=this.counts.length; idx<n; ++idx){
cnt=this.counts[idx];
amount=cnt.d.getTime()-now;//calc milliseconds between dates
// if time is already past
if(amount<0){
expired.push(idx);
}
// date is still good
else{
this.display(cnt, this.format(this.math(amount)));
}
}
// deal with any expired
if(expired.length>0) this.expire(expired);
// if no active counts, stop updating
if(this.counts.length==0) window.clearTimeout(this.interval);
},
display: function(cnt,msg){
document.getElementById(cnt.id).innerHTML=msg;
}
};
window.onload=function(){
var cdown = new CDown();
cdown.add(new Date(2017,1,16,19,43,46), "countbox1");
};
</script>
<div id="countbox1"></div>