http://www.cnblogs.com/vajoy/p/4263291.html

https://www.baidu.com/s?wd=%E5%89%8D%E7%AB%AF%E6%A1%86%E6%9E%B6%E6%9C%89%E5%93%AA%E4%BA%9B&ie=utf-8&tn=58025142_oem_dg