确保在该 socket 上不再有 I/O 活动。仅在出现错误的时候才需要(如解析错误等)。

如果制定了 exception,则将会触发一个 'error' 事件,任何监听器都将接收到 exception 作为一个参数。

Ensures that no more I/O activity happens on this socket. Only necessary in case of errors (parse error or so).

If exception is specified, an 'error' event will be emitted and any listeners for that event will receive exception as an argument.