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Notification 的只读属性 permission 用来表明用户是否允许当前域显示Web Notification. 

Note: 此特性在 Web Worker 中可用。

Syntax

var permission = Notification.permission;

Value

permission 的类型为 DOMString . 该属性的可能值为:

  • granted: 用户已经明确的授予了显示通知的权限。.
  • denied: 用户已经明确的拒绝了显示通知的权限。
  • default: 用户还未被询问是否授权; 这种情况下权限将视为 denied.

Examples

下面的代码片段详细的说明了,当你首次检查浏览器是否支持Notification,然后检查当前域是否被授予了发送Notification的权限,并且在发送一个通知前进行请求的用法.

function notifyMe() {
  // Let's check if the browser supports notifications
  if (!("Notification" in window)) {
    console.log("This browser does not support desktop notification");
  }

  // Let's check whether notification permissions have alredy been granted
  else if (Notification.permission === "granted") {
    // If it's okay let's create a notification
    var notification = new Notification("Hi there!");
  }

  // Otherwise, we need to ask the user for permission
  else if (Notification.permission !== 'denied' || Notification.permission === "default") {
    Notification.requestPermission(function (permission) {
      // If the user accepts, let's create a notification
      if (permission === "granted") {
        var notification = new Notification("Hi there!");
      }
    });
  }

  // At last, if the user has denied notifications, and you 
  // want to be respectful there is no need to bother them any more.
}

Specifications

Specification Status Comment
Notifications API
permission
Living Standard Living standard

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 5 webkit (see notes)
22
(Yes) 4.0 moz (see notes)
22
未实现 25 6 (see notes)
Available in workers ? ? 41.0 (41.0) ? ? ?
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ?

(Yes)

(Yes) 4.0 moz (see notes)
22
1.0.1 moz (see notes)
1.2
未实现 ? 未实现

(Yes)

Available in workers ? ? ? 41.0 (41.0) ? ? ? ? ?

Firefox OS notes

Chrome notes

Safari notes

See also

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