message: Support event.which
diff: @@ -33,7 +33,8 @@ define(function (require) {
  pinchY: event.pinchY,
  pinchScale: event.pinchScale,
  wheelDelta: event.zrDelta,
  - zrByTouch: event.zrByTouch
  + zrByTouch: event.zrByTouch,
  + which: event.which
  };
  }
  