几个要清理的地方

http://blog.csdn.net/qq_25073253/article/details/73730249?locationNum=5&fps=1

https://groups.google.com/forum/#!topic/digits-users/FfeFp0MHQfQ

http://blog.csdn.net/c437yuyang/article/details/76686212

http://www.cnblogs.com/denny402/p/5082341.html