port.close()

禁止连接双方进一步发送消息。
当不再通过此 MessagePort 进行通信时，可以调用此方法。

🌐 Disables further sending of messages on either side of the connection. This method can be called when no further communication will happen over this MessagePort.

'close' 事件 会在通道中属于的两个 MessagePort 实例上触发。

🌐 The 'close' event is emitted on both MessagePort instances that are part of the channel.