如何使用电子派生一个子进程

const { app, BrowserWindow } = require('electron');
const { spawn } = require('child_process');

let mainWindow;

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true
    }
  });

  mainWindow.loadFile('index.html');

  // 在窗口加载完成后，派生一个子进程
  mainWindow.webContents.on('did-finish-load', () => {
    const child = spawn('ls', ['-l']);

    child.stdout.on('data', (data) => {
      console.log(`子进程输出：${data}`);
    });

    child.stderr.on('data', (data) => {
      console.error(`子进程错误：${data}`);
    });

    child.on('close', (code) => {
      console.log(`子进程退出，退出码 ${code}`);
    });
  });

  mainWindow.on('closed', () => {
    mainWindow = null;
  });
}

app.on('ready', createWindow);

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', () => {
  if (mainWindow === null) {
    createWindow();
  }
});