Electron启动有个短暂的白屏时间，原因是渲染进程的代码还未加载完毕

有两个解决方案

1. 第一种方案是配置一个loading.html，设置show为false，然后等窗口ready-to-show的时候关闭loading,然后加载内容

   async function createWindow() {
     win = new BrowserWindow({
       frame: false,
       show: false,
       webPreferences: {
         nodeIntegration: process.env.ELECTRON_NODE_INTEGRATION,
         contextIsolation: !process.env.ELECTRON_NODE_INTEGRATION,
         preload: path.join(__dirname, 'preload.js'),
         nativeWindowOpen: true,
       },
     });
   
     if (process.env.WEBPACK_DEV_SERVER_URL) {
       await win.loadURL(process.env.WEBPACK_DEV_SERVER_URL);
       // if (!process.env.IS_TEST) win.webContents.openDevTools();
     } else {
       createProtocol('app');
       win.loadURL('app://./index.html');
     }
   
   	win.once('ready-to-show', () => {
         win.show();
   	 });
   }