'close' 事件

一旦通道的任一侧断开连接，则会触发 'close' 事件。

const { MessageChannel } = require('node:worker_threads');
const { port1, port2 } = new MessageChannel();

// 打印:
//   foobar
//   closed!
port2.on('message', (message) => console.log(message));
port2.on('close', () => console.log('closed!'));

port1.postMessage('foobar');
port1.close();

The 'close' event is emitted once either side of the channel has been disconnected.

const { MessageChannel } = require('node:worker_threads');
const { port1, port2 } = new MessageChannel();

// Prints:
//   foobar
//   closed!
port2.on('message', (message) => console.log(message));
port2.on('close', () => console.log('closed!'));

port1.postMessage('foobar');
port1.close();