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 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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