http://blog.csdn.net/lccyxm/article/details/52015918
http://blog.csdn.net/ywjun0919/article/details/47659465
http://blog.csdn.net/liqiangeastsun/article/details/42124469 这是创建prefab的脚本方法
http://blog.csdn.net/u012842807/article/details/49428045
http://www.xuanyusong.com/archives/1427
