JavaScript-How does an IM that is nested inside a page implement a weak question? For example, the bottom right corner of Renren.

Is it timed Ajax acquisition?

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Is it timed Ajax acquisition?

Long polling, or comet, is a long connection that hangs there so that you can return immediately when there is a message, and then create a new long connection.

Ajax timing acquisition can be achieved, the better solution is to use the Ajax long polling, specifically, Google's own

XMPP + Conversejs

1. Comet Long Connection
2. Advanced Browser WebSockets
3. Ajax polling, when real-time requirements are not high.

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