在此页

• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

activate event of the ServiceWorkerGlobalScope interface is fired when a ServiceWorkerRegistration acquires a new ServiceWorkerRegistration.active worker.

冒泡	No
可取消	No
接口	ExtendableEvent
事件处理程序特性	ServiceWorkerGlobalScope.onactivate

范例

The following snippet shows how you could use an activate event handler to upgrade a cache.

globalScope.addEventListener('activate', function(event) {
  var cacheWhitelist = ['v2'];
  event.waitUntil(
    caches.forEach(function(cache, cacheName) {
      if (cacheWhitelist.indexOf(cacheName) == -1) {
        return caches.delete(cacheName);
      }
    })
  );
});
					

You can also set up the event handler using the ServiceWorkerGlobalScope.onactivate 特性：

globalScope.onactivate = function(event) {
  ...
};
					

规范

规范	状态	注释
服务工作者 The definition of 'activate' in that specification.	工作草案

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
activate event	Chrome 40	Edge ≤79	Firefox 44 44 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No	Opera 24	Safari 11.1	WebView Android 40	Chrome Android 40	Firefox Android 44	Opera Android 24	Safari iOS 11.3	Samsung Internet Android 4.0

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

见实现注意事项。

另请参阅

• 安装 event
• ServiceWorkerGlobalScope
• 服务工作者 API

元数据

• 最后修改： Sep 1, 2020

相关话题

1. 服务工作者 API
2. ServiceWorkerGlobalScope
3. 特性

   1. caches
   2. clients
   3. onactivate
   4. onfetch
   5. oninstall
   6. onmessage
   7. onnotificationclick
   8. onnotificationclose
   9. onpush
   10. onpushsubscriptionchange
   11. registration
4. 方法

   1. skipWaiting()
5. 事件

   1. activate
   2. 安装
   3. message
   4. notificationclick
   5. push
   6. pushsubscriptionchange
6. 继承：

   1. WorkerGlobalScope
   2. EventTarget
7. Related pages for Service Workers API

   1. 缓存
   2. CacheStorage
   3. Client
   4. Clients
   5. ExtendableEvent
   6. FetchEvent
   7. InstallEvent
   8. Navigator.serviceWorker
   9. NotificationEvent
   10. PeriodicSyncEvent
   11. PeriodicSyncManager
   12. PeriodicSyncRegistration
   13. ServiceWorker
   14. ServiceWorkerContainer
   15. ServiceWorkerRegistration
   16. SyncEvent
   17. SyncManager
   18. SyncRegistration
   19. WindowClient