PushManager.getSubscription()

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句法
范例
规范
浏览器兼容性
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这是实验性技术
检查浏览器兼容性表格要小心谨慎在生产中使用这之前。

PushManager.getSubscription() 方法在 PushManager interface retrieves an existing push subscription.

It returns a Promise 解析为 PushSubscription object containing details of an existing subscription. If no existing subscription exists, this resolves to a null 值。

句法

PushManager.getSubscription().then(function(pushSubscription) { ... } );

参数

None.

A Promise 解析为 PushSubscription object or null .

范例

This code snippet is taken from a push messaging and notification sample . (No live demo is available.)

// We need the service worker registration to check for a subscription
  navigator.serviceWorker.ready.then(function(serviceWorkerRegistration) {
    // Do we already have a push message subscription?
    serviceWorkerRegistration.pushManager.getSubscription()
      .then(function(subscription) {
        // Enable any UI which subscribes / unsubscribes from
        // push messages.
        var pushButton = document.querySelector('.js-push-button');
        pushButton.disabled = false;
        if (!subscription) {
          // We aren’t subscribed to push, so set UI
          // to allow the user to enable push
          return;
        }
        // Keep your server in sync with the latest subscriptionId
        sendSubscriptionToServer(subscription);
        showCurlCommand(subscription);
        // Set your UI to show they have subscribed for
        // push messages
        pushButton.textContent = 'Disable Push Messages';
        isPushEnabled = true;
      })
      .catch(function(err) {
        window.Demo.debug.log('Error during getSubscription()', err);
      });
  });

规范

规范	状态	注释
Push API The definition of 'getSubscription()' in that specification.	工作草案	初始定义。

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
`getSubscription`	Chrome 42	Edge 16 Disabled 16 Disabled Disabled From version 16: this feature is behind the `Enable service workers` preference. 17	Firefox 44 44 注意事项注意事项 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE 不支持 No	Opera 29	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 42	Firefox Android 48 48 注意事项注意事项 Push enabled by default.	Opera Android 29	Safari iOS 不支持 No	Samsung Internet Android 4.0

图例

完整支持
不支持
实验。期望将来行为有所改变。
见实现注意事项。
用户必须明确启用此特征。

元数据

最后修改： 2020 年 1 月 22 日

Push API
PushManager
特性
1. supportedContentEncodings
方法
1. getSubscription()
2. hasPermission()
3. permissionState()
4. register()
5. registrations()
6. subscribe()
7. unregister()
Related pages for Push API

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句法

参数

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范例

规范

浏览器兼容性

图例

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