long polling,或者叫做comet,就是用长连接挂在那里,这样在有消息的时候可以立刻返回;然后再建立一个新的长连接。
ajax定时获取可以实现,更好的方案是使用ajax长轮询,具体请自行google之
xmpp + conversejs
comet长连接
高级浏览器websockets
ajax轮询,实时性要求不高的情况时。
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