在使用 close() 关闭套接字后会触发 'close' 事件。 一旦触发,则此套接字上将不会触发新的 'message' 事件。
close()
'close'
'message'
The 'close' event is emitted after a socket is closed with close(). Once triggered, no new 'message' events will be emitted on this socket.