Notification.permission - Web API 接口参考 编辑

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

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

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

• Using the Notifications API
• Permissions API