socket.remoteAddress()
返回包含远程端点的 address、family 和 port 的对象。如果套接字未连接，则此方法将抛出 ERR_SOCKET_DGRAM_NOT_CONNECTED 异常。
¥Returns an object containing the address, family, and port of the remote
endpoint. This method throws an ERR_SOCKET_DGRAM_NOT_CONNECTED exception
if the socket is not connected.