学习mark
http://www.cnblogs.com/carriezhao/p/6861319.html
http://smiky.iteye.com/blog/1917700
http://www.cnblogs.com/rubylouvre/archive/2012/10/24/2730599.html
学习mark
http://www.cnblogs.com/carriezhao/p/6861319.html
http://smiky.iteye.com/blog/1917700
http://www.cnblogs.com/rubylouvre/archive/2012/10/24/2730599.html