安全上下文
此特征只可用于 安全上下文 (HTTPS)，在某些或所有 支持浏览器 .

permission 只读特性在 Notification interface indicates the current permission granted by the user for the current origin to display web notifications.

句法

var permission = Notification.permission;
					

值

A DOMString representing the current permission. The value can be:

• granted : The user has explicitly granted permission for the current origin to display system notifications.
• denied : The user has explicitly denied permission for the current origin to display system notifications.
• default : The user decision is unknown; in this case the application will act as if permission was denied .

范例

The following snippet could be used if you wanted to first check whether notifications are supported, then check if permission has been granted for the current origin to send notifications, then request permission if required, before then sending a notification.

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.
}
					

规范

规范	状态	注释
Notifications API The definition of 'permission' in that specification.	实时标准	Living standard

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
permission	Chrome Yes	Edge 14	Firefox Yes	IE No	Opera Yes	Safari Yes	WebView Android No	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS No	Samsung Internet Android Yes

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Notifications API
• Using the Notifications API
• 权限 API
• 使用权限 API

元数据

• 最后修改： Jul 23, 2020