javascript - 弱问下嵌套在页面内的IM是怎么实现的？比如人人网右下角的。
是定时ajax获取么？
回复内容：
是定时ajax获取么？
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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