cocos creator 2.3.1打包成安卓apk 按键无法响应

Creator 2.x
#1

onLoad () {
cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);

},

onKeyDown:function(){
  cc.find("Canvas/New Label").getComponent(cc.Label).string = "按键值:"+event.keyCode;
},

keyCode打印不出来 好像事件监听不到

#2

onKeyDown:function(event){
cc.find(“Canvas/New Label”).getComponent(cc.Label).string = “按键值:”+event.keyCode;
},