http://www.cnblogs.com/xdp-gacl/p/3718879.html#2937655

http://www.cnblogs.com/jiangz/p/3734968.html

https://blog.csdn.net/shuai7boy/article/details/105816946

https://www.cnblogs.com/guangzan/p/12692795.html#%E7%BB%99%E6%A0%87%E9%A2%98%E6%B7%BB%E5%8A%A0%E6%B4%BB%E8%B7%83%E6%A0%B7%E5%BC%8F