实现效果:

主进程main.js

const { app, BrowserWindow, ipcMain } = require('electron')
app.on('ready', () => {
    const win = new BrowserWindow({
        width: 800, height: 600,
        webPreferences: {
            enableRemoteModule: true,
            nodeIntegration: true,
            contextIsolation: false,
        }
    })
    win.loadURL(`file://${__dirname}/newWindow.html`)
    ipcMain.on('openWindow', () => {
        const childWin = new BrowserWindow({ width: 800, height: 600 })
        childWin.loadURL("https://www.baidu.com")
    })
})

渲染进程 renderer.js

const { ipcRenderer } = require('electron')
const openWindowBtn = document.getElementById('openWindowBtn')
openWindowBtn.addEventListener('click', () => {
    ipcRenderer.send('openWindow')
})

主窗口页面 newWindow.html

<button id="openWindowBtn">打开新窗口</button>
<script src="renderer.js"></script>