临时记录

http://blog.csdn.net/welcomeem/article/details/51893797
http://dockone.io/article/394
http://www.cnblogs.com/kluan/p/5989960.html
http://blog.csdn.net/u012124438/article/details/54236967
https://www.zhihu.com/question/25536695
http://blog.csdn.net/yinwenjie/article/details/49453303
http://blog.csdn.net/zjx86320/article/details/51019050