code: function triggerTouch(eventName, mouseEv) {
    var touchEvent = document.createEvent('Event');
    touchEvent.initEvent(eventName, true, true);
  
    touchEvent.altKey = mouseEv.altKey;
    touchEvent.ctrlKey = mouseEv.ctrlKey;
    touchEvent.metaKey = mouseEv.metaKey;
    touchEvent.shiftKey = mouseEv.shiftKey;
  
    touchEvent.touches = getActiveTouches(mouseEv);
    touchEvent.targetTouches = getActiveTouches(mouseEv);
    touchEvent.changedTouches = createTouchList(mouseEv);
  
    eventTarget.dispatchEvent(touchEvent);
  }
docs: trigger a touch event
  @param eventName
  @param mouseEv