4.4 WebSockets 实现 WebSockets 允许双向，全双工通信信道，在 TCP socket 中。它被设计为允许一个 Web 浏览器和 Web 服务器之间通过数据流交互。
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There are also lots of libraries for doing new experimental stuff like websockets and the community is very active.
还有很多库在尝试一些新的事情，比如websockets，社区也非常活跃。
Michael: The issues are that browsers have been shipping incrementally updated versions of the websockets protocol while the spec itself has been evolving.
Michael：问题在于浏览器不断升级携带的Websockets协议，同时规范本身也在不断演进。
We use Socket.IO, which abstracts over websockets and provides fallbacks to support websocket-style communication for browsers that don’t have websockets yet.
我们使用Socket.IO， 它对WebSocket进行了抽象， 还对尚没有WebSocket的浏览器提供了应变方案， 以支持WebSocket式的通信。
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