socket.remoteAddress

用字符串表示的远程 IP 地址。例如 '74.125.127.100' 或 '2001:4860:a005::68'。如果 socket 被销毁了（如客户端已经失去连接）则其值为 undefined。

The string representation of the remote IP address. For example, '74.125.127.100' or '2001:4860:a005::68'. Value may be undefined if the socket is destroyed (for example, if the client disconnected).