Vibration Polyfill using sound (prototype)

Vibration Polyfill

navigator.q1Vibrate = function(){
  var native = navigator.vibrate || navigator.mozVibrate || navigator.wekbitVibrate;
	if(native){
		return native;
	}

	var scripts = document.getElementsByTagName('script');
	var script = scripts[scripts.length-1];
	var path = script.src.replace(/vibrate.js/,'');

	var mp3File = path+'vibrate.mp3';
	var audioEl = new Audio(mp3File);
	audioEl.setAttribute('loop','loop');

	return function(arg){
		var durations = arg.length ? arg : [arg];
		var counter = 0;

		function next(){
			stop();
			if(!durations.length){return;}
			++counter%2===1 && play();
			setTimeout( next, durations.shift() );
		}
		next();

		function play(){
			audioEl.muted = true;
			audioEl.play();
			audioEl.muted = false;
		} 
		function stop(){ 
			audioEl.muted = true;
			audioEl.currentTime = 0;
			audioEl.pause();
		} 
	};
}();