http://blog.csdn.net/bigtree_3721/article/details/77417518
http://blog.csdn.net/zengxuewen2045/article/details/51589223
http://blog.itpub.net/26506993/viewspace-2109505/
https://www.cnblogs.com/yelbosh/p/5813865.html
https://www.cnblogs.com/jukan/p/5670950.html
http://hedengcheng.com/?p=771
http://blog.csdn.net/zhangjikuan/article/details/78429613