Contador

by Pasky Org

HTML

Contador: <span id="contador"> </span>

JavaScript

var t = Math.floor(new Date()/1000 + 3600);

var timeleft = 300;
var downloadTimer = setInterval(function(){
  document.getElementById("contador").textContent = --timeleft;
  if(timeleft <= 0)
    clearInterval(downloadTimer);
},1000);