worker_threads.receiveMessageOnPort(port)

• port <MessagePort> | <BroadcastChannel>
• 返回：<Object> | <undefined>

从指定的 MessagePort 接收一条消息。如果没有可用的消息，则返回 undefined，否则返回一个包含单个 message 属性的对象，该属性包含消息负载，对应于 MessagePort 队列中最旧的消息。

【Receive a single message from a given MessagePort. If no message is available, undefined is returned, otherwise an object with a single message property that contains the message payload, corresponding to the oldest message in the MessagePort's queue.】

import { MessageChannel, receiveMessageOnPort } from 'node:worker_threads';
const { port1, port2 } = new MessageChannel();
port1.postMessage({ hello: 'world' });

console.log(receiveMessageOnPort(port2));
// Prints: { message: { hello: 'world' } }
console.log(receiveMessageOnPort(port2));
// Prints: undefined'use strict';

const { MessageChannel, receiveMessageOnPort } = require('node:worker_threads');
const { port1, port2 } = new MessageChannel();
port1.postMessage({ hello: 'world' });

console.log(receiveMessageOnPort(port2));
// Prints: { message: { hello: 'world' } }
console.log(receiveMessageOnPort(port2));
// Prints: undefined拷贝

当使用此函数时，不会触发 'message' 事件，并且不会调用 onmessage 监听器。

【When this function is used, no 'message' event is emitted and the onmessage listener is not invoked.】