{
        label: 'about Electron',
        // Set menu roles
        role: 'about', // about, this value is only for Mac OS X systems
        // Click event is invalid when the role attribute of click event can be recognized
        click: () => {
          var aboutWin = new BrowserWindow({ width: 300, height: 200, parent: win, modal: true });
          aboutWin.loadFile('about.html');
        }
      },