您可以将浏览器窗口变量定义为全局变量，并在单击通知时使用show（）函数显示该变量。

var browserWindow = null;

function createWindow () {
  browserWindow = new BrowserWindow({
    width: 800,
    height: 600
  })

  browserWindow.loadFile('index.html')
}

app.whenReady().then(createWindow);

function showNotification (body_content) {
  let myNotification = new Notification({ title: NOTIFICATION_TITLE, 
    body: `Incoming Call from ${body_content}` })

  console.log(myNotification,'notification')
  myNotification.show()
  myNotification.on('click', (event, arg)=>{
    console.log("notification clicked")
    browserWindow.show()
  })
}