server.close([callback])
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callback<Function> 监听器回调,将被注册以监听服务器实例的'close'事件。¥ callback<Function> A listener callback that will be registered to listen for the server instance's'close'event.
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返回:<tls.Server> ¥Returns: <tls.Server> 
server.close() 方法阻止服务器接受新连接。
¥The server.close() method stops the server from accepting new connections.
此函数异步地运行。当服务器没有更多打开的连接时,则将触发 'close' 事件。
¥This function operates asynchronously. The 'close' event will be emitted
when the server has no more open connections.