Notification.sound

 sound 是 Notification的只读属性，interface specifies the URL of an audio file to be played when the notification fires. This is specified in the sound option of the Notification() constructor.

var sound = Notification.sound;

A USVString.

The following snippet is intended to fire a sound along with the notification; a simple options object is created, then the notification is fired using the Notification() constructor.

var options = {
  body: 'Do you like my body?',
  sound: 'audio/alert.mp3'
}

var n = new Notification('Test notification',options);

n.sound // should return 'audio/alert.mp3'

• Using the Notifications API