socket.close([callback])
callback
<Function> 当套接字关闭时调用。
关闭底层套接字并停止监听其上的数据。
如果提供回调,则将其添加为 'close'
事件的监听器。
callback
<Function> Called when the socket has been closed.
Close the underlying socket and stop listening for data on it. If a callback is
provided, it is added as a listener for the 'close'
event.