HTML5 服务器推送事件(Server-sent Events)
http://www.ibm.com/developerworks/cn/web/1307_chengfu_serversentevent/index.html?ca=drs
http://www.w3school.com.cn/html5/html_5_serversentevents.asp
http://www.ibm.com/developerworks/cn/web/1307_chengfu_serversentevent/index.html?ca=drs
http://www.w3school.com.cn/html5/html_5_serversentevents.asp