参考文档：
http://blog.csdn.net/jdh99/article/details/39525451
http://blog.csdn.net/jdh99/article/details/39204129
http://blog.csdn.net/jdh99/article/details/6226435
http://www.oschina.net/code/snippet_1243295_48623
本文共 210 字，大约阅读时间需要 1 分钟。
参考文档：
http://blog.csdn.net/jdh99/article/details/39525451
http://blog.csdn.net/jdh99/article/details/39204129
http://blog.csdn.net/jdh99/article/details/6226435
http://www.oschina.net/code/snippet_1243295_48623