http://blog.csdn.net/by_mxy/article/details/12027685
http://zilongshanren.com/blog/2012/10/29/cocos2d-x-design-pattern-6-observer/
http://blog.csdn.net/by_mxy/article/details/12027685
http://zilongshanren.com/blog/2012/10/29/cocos2d-x-design-pattern-6-observer/