'timeout' 事件
当 socket 超时的时候触发。该事件只是用来通知 socket 已经闲置。用户必须手动关闭。
也可以查看:socket.setTimeout()
。
Emitted if the socket times out from inactivity. This is only to notify that the socket has been idle. The user must manually close the connection.
See also: socket.setTimeout()
.