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1·Long Polling: Also known as Asynchronous Polling, this method is a hybrid of pure server push and client pull.

长时间轮询：也就是所谓的异步轮询，这种方式是纯服务器端推送方式和客户端拉取方式的混合。

2·In this article, I discussed various approaches for simulating a server push, ranging from pure polling to a real-time server push, and noted the strengths and weaknesses of each approach.

这篇文章讨论了几种模拟服务器推送的方法，从纯轮询到实时服务器推送，文中说明了每种方法的优缺点。