本资源用于对cocos2dx + Box2D下的手游开发学习，用于对旋转关节，子弹添加 ，子弹发射的学习。-The resources for the development of mobile games under study cocos2dx+ Box2D, for rotary joints, add bullets, bullets fired learn.

学习box2d样例，值得一看-Learning box2d example