SOURCE

//support.js
//console.log('进程 ' + process.argv[2] + '执行.');

const fs = require('fs');
const child_process = require('child_process');

//child_process.exec(command[, options], callback) 使用子进程执行命令，缓存子进程的输出，并将子进程的输出以回调函数参数的形式返回。
for(var i = 0; i < 3; i++){
  var workerProcess = child_process.exec('node support.js ' + i, function(error, stdout, stderr){
    if(error){
      console.log(error.stack);
      console.log('Error code: ' + error.code);
      console.log('Signal received: ' + error.signal);
    }
    console.log('stdout: ' + stdout);
    console.log('stderr ' + stderr);
  });
  workerProcess.on('exit', function(code){
    console.log('子进程已退出，退出码 ' + code);
  });
}
//child_process.spawn(command[, args][, options]) 使用指定的命令行参数创建新进程
for(var i = 0; i < 3; i++){
  var workerProcess = child_process.spawn('node', ['support.js', i]);
  workerProcess.stdout.on('data', function(data){
    console.log('stdout: ' + data);
  });
  workerProcess.stderr.on('data', function(data){
    console.log('stderr: ' + data);
  });
  workerProcess.on('close', function(code){
    console.log('子进程已退出，退出码 ' + code);
  });
}

//child_process.fork(modulePath[, args][, options]) 是 spawn() 方法的特殊形式，用于创建进程
for(var i = 0; i < 3; i++){
  var worker_process = child_process.fork('support.js', [i]);
  worker_process.on('close', function(code){
    console.log('子进程已退出，退出码 ' + code);
  });
}