键盘的相应事件有两种，按下事件和抬起事件。cocos的Demo在E:\cocos2d-x-3.6\tests\cpp-tests\Classes\NewEventDispatcherTest这个目录下，LabelKeyboardEventTest是其测试代码。代码很简单，随意看下就知道怎么使用了。
下面也实现一个Demo：
auto listener = EventListenerKeyboard ::create ();
listener ->onKeyPressed = []( EventKeyboard:: KeyCode keyCode,Event * event ){
log ("KeyPress:%d",keyCode );
};
listener -> onKeyReleased = []( EventKeyboard ::KeyCode keyCode,Event * event ){
log ("KeyRelease:%d",keyCode );
};
_eventDispatcher ->addEventListenerWithSceneGraPHPriority ( listener,this );
