worker parentport

• {null|MessagePort}

如果当前线程为[Worker][]工作线程, 该[MessagePort][]端口作用于与主线交换信息。通过该端口parentPort.postMessage()发送的消息在主线程中将可以通过worker.on('message')接收。主线程中通过worker.postMessage()发送的消息将可以在工作线程中通过parentPort.on('message')接收。

const { Worker, isMainThread, parentPort } = require('worker_threads');
if (isMainThread) {
  const worker = new Worker(__filename);
  worker.once('message', (message) => {
    console.log(message);  // Prints 'Hello, world!'.
  });
  worker.postMessage('Hello, world!');
} else {
  // When a message from the parent thread is received, send it back:
  parentPort.once('message', (message) => {
    parentPort.postMessage(message);
  });
}