Async Function Queueing

aq.js

var _aq = [],
  funcs = [function () {
    console.log('Handler 1 executed.');
  }, function () {
    console.log('Handler 2 executed.');
  }];
  
_aq.push(funcs);

(function() {
  var aq = document.createElement('script');
  aq.setAttribute('class', 'aq');
  aq.async = true;
  aq.src = 'http://domain.com/async-exec.js';
  var s = document.querySelector('.aq')[0];
  s.parentNode.insertBefore(gq,s);
})();

async-exec.js

'use strict';

(function (handlers, w, d, u) {
  var i;
  // executre handlers in queue
  for(i = 0; i < handlers.length; i++) {
    h = hanlders[i];
    h.apply(w, h.arguments);
  }
})(_aq, window, document, undefined);