main.js

const {app, BrowserWindow} = require('electron')
const path = require('path')
const url = require('url')

let win;

function createWindow(){
  win = new BrowserWindow({windth:800,height:600})
  win.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:', //http https
    slashes: true
  })
)
win.on('close',() =>{
    win = null;
  })
}

app.on("ready",createWindow);