node . js messagechannel . postmessage()方法
原文:https://www . geesforgeks . org/node-js-message channel-postmessage-method/
messageport . postmessage()方法是 worker_threads 模块中 Worker 类的内置应用编程接口，用于将消息从一个端口发送到另一个端口。
语法:
const MessagePort.postMessage(value[, transferList])
参数:该方法以值为参数，可以包含任意一种对象。
返回值:此方法将消息从一个端口发送到另一个端口。
示例 1: 文件名:index.js
java 描述语言
// Node.js program to demonstrate the
// MessageChannel.postMessage() method
// Importing worker_thread module
const { MessageChannel, receiveMessageOnPort }
= require('worker_threads');
// Creating and initializing the MessageChannel
const { port1, port2 } = new MessageChannel();
// Sending data to port 2
// by using postMessage() method
port1.postMessage({ hello: 'world1' });
// Posting data in port 1
// by using postMessage() method
port2.postMessage({ hello: 'world2' });
/// Display the result
console.log("received data in port1 : ");
console.log(receiveMessageOnPort(port1));
console.log("received data in port2 : ");
console.log(receiveMessageOnPort(port2));
// Closing the ports
port1.close();
port2.close();
输出:
received data in port1 :
{ message: { hello: 'world2' } }
received data in port2 :
{ message: { hello: 'world1' } }
示例 2: 文件名:index . js
Javascript
// Node.js program to demonstrate the
// MessageChannel.postMessage() method
// Importing worker_thread module
const { MessageChannel, receiveMessageOnPort }
= require('worker_threads');
// Creating and initializing the MessageChannel
const { port1, port2 } = new MessageChannel();
// Catching the event message
port2.on('message', (message) => console.log(message));
// Catching the event close
port2.on('close', () => console.log('closed!'));
// Sending message to port2
// by using postMessage() method
port1.postMessage('GFG');
// Closing port by using
// close() method
port1.close();
输出:
GFG
closed!
使用以下命令运行 index.js 文件:
node index.js
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