myApp/main.js

// Modules to control application life and create native browser window
const {app, BrowserWindow} = require('electron')
const path = require('path')
const fs = require('fs')
// 读取配置文件
const config = JSON.parse(fs.readFileSync('./config.json', 'utf-8'))

function createWindow () {
  // Create the browser window.
  let webConfig = {
    width: config.width,
    height: config.height,
    webPreferences: {}
  }
  if (config.preload) {
    webConfig.webPreferences.preload = config.preload
  }
  const mainWindow = new BrowserWindow(webConfig)

  // and load the index.html of the app.
  // mainWindow.loadFile('index.html')
  mainWindow.loadURL(config.url)
  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.whenReady().then(() => {
  createWindow()
  
  app.on('activate', function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})

// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.