setTimeout setInterval timer handler. Access them via `window.timers`

Timers.js

(function(w){
  var oldST = w.setTimeout;
  var oldSI = w.setInterval;
  var oldCI = w.clearInterval;
  var timers = [];
  w.timers = timers;
  w.setTimeout = function(fn, delay){
    var id = oldST(function(){
      fn && fn();
      removeTimer(id);
    }, delay);
    timers.push(id);
    return id;
  };
  w.setInterval = function(){
    var id = oldSI.apply(this, arguments);
    timers.push(id);
    return id;
  };
  w.clearInterval = function(id){
    oldCI(id);
    removeTimer(id);
  };
  w.clearTimeout = w.clearInterval;

  function removeTimer(id){
    var index= timers.indexOf(id);
    if(index >= 0)
      timers.splice(index, 1);
  }
}(window));