Chrome 将 Notification.requestPermission() 的“default”结果视​​为“dennied”

window.Notification.requestPermission().then((result) => {
  if (result === 'denied') {
     // the user has denied permission
     return;
  }

  if (result === 'default') {
    // the user has closed the dialog
    if (window.Notification.permission === 'denied') {
       // the browser has decided to automatically denied permission 
    }
    return;
  }

  // the user has granted permission
});