Node child processes and threads

master.js file

const cp = require('child_process')  // Control the scheduling of subprocesses

const child_process = cp.fork(__dirname + './child.js');  // Create child process , Parameters are child process entries js

child_process.send('haha'); // Send messages to child processes

child_process.on('message',(str) => {

     console.log(str);  // The main process receives messages sent by child processes

})

child.js file

process.on('message',(str) => { //process Is a global variable

      console.log(str);

　　process.send('hehe');  // The child process sends messages to the main process

}) // The subprocess accepts the message

function node master.js　　 Output haha　　　 The main process does not exit at this time