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。
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。
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。
The user can establish several connections to different servers at the same time. For example, the user can connect to a normal game server, and another server for voice chat.
用户可以同时建立多个连接与多个服务器同时进行通信，比如除了连接常规的游戏服务器，还可以连接语音聊天服务器。
The user can establish several connections to different servers at the same time. For example, the user can connect to a normal game server, and another server for voice chat.
用户可以同时建立多个连接与多个服务器同时进行通信，比如除了连接常规的游戏服务器，还可以连接语音聊天服务器。
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