留帖子方便学习:
http://www.jianshu.com/p/41ecb06ae95f#
http://www.2cto.com/kf/201606/517052.html
u3d 以及cocos2d-x
http://www.xuanyusong.com/archives/3349
http://www.jianshu.com/p/af6f8260a811
http://www.taikr.com/article/386