function touchEventHandlerFactory(type) {
  return function (event) {
    var touchEvent = new TouchEvent(type);
    touchEvent.touches = event.touches;
    touchEvent.targetTouches = Array.prototype.slice.call(event.touches);
    touchEvent.changedTouches = event.changedTouches;
    touchEvent.timeStamp = event.timeStamp;
    _document2.default.dispatchEvent(touchEvent);
  };
}
wx.onTouchStart(touchEventHandlerFactory('touchstart'));
wx.onTouchMove(touchEventHandlerFactory('touchmove'));
wx.onTouchEnd(touchEventHandlerFactory('touchend'));
wx.onTouchCancel(touchEventHandlerFactory('touchcancel'));
pc上启动小游戏，切换为全屏后点击屏幕touches返回的坐标，始终为小屏时的坐标