IOS开发网络环境检测

参考文章：

http://blog.csdn.net/caryaliu/article/details/7799432

http://www.1000phone.net/thread-8257-1-1.html

http://www.yifeiyang.net/iphone-web-development-skills-of-the-article-4-make-sure-the-network-environment-3gwifi/