Now let's walk through the code and explain how the example fulfills the defined expectation of what a chat server is and does. The first line allows access to the contents of the net module.

现在，让我们检查所有代码，并解释这个例子如何实现聊天服务器预定功能。

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Facebook chat provides an example of an interesting problem with AJAX: pushing data from server to client.

Facebook聊天功能提供了关于AJAX一个有意思的问题案例：把数据从服务器端推送到客户端。

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The definition of the server is similar to the chat server example.

Server的定义类似于聊天服务器的例子。

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