一旦订阅了主题，就将根据此主题发布的所有消息发送到订阅服务器。

Once subscribed to a topic, all messages that are published on that topic will be sent to the subscriber.

youdao

php页面返回发布到服务器的最新消息。

Page returns the latest messages posted to the server.

youdao

发布/订阅消息模型极其强大，可以将UI元素本身及UI元素与服务器端进行解耦。

The publish/subscribe messaging paradigm is EXTREMELY powerful and enables clean decoupling of user-interface elements from each other, and from the serverside.

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