HTML5 push
http://blog.csdn.net/yo548720570/article/details/8599947
http://www.oschina.net/question/82993_63312
http://bbs.lampbrother.net/read-htm-tid-149631.html
http://drublic.de/blog/the-difference-between-push-and-pull/
http://dsheiko.com/weblog/html5-and-server-sent-events/
出处:http://cnblogs.com/daishuguang