1、https://www.cnblogs.com/shimily/articles/7943370.html
2、https://www.cnblogs.com/stoneniqiu/p/6077112.html ****
3、https://blog.csdn.net/zhangmeng1020/article/details/50886185/
4、https://blog.csdn.net/quake_walk/article/details/52298303
5、https://blog.csdn.net/csdn_chenli/article/details/52946143
6、https://blog.csdn.net/fengltxx/article/details/53350284
7、https://www.cnblogs.com/quietwalk/p/7443692.html
原文：https://www.cnblogs.com/lmxxlm-123/p/9210498.html