MDN wants to learn about developers like you:



The active property of the ServiceWorkerRegistration interface returns a service worker whose ServiceWorker.state is activating or activated. This property is initially set to null.

An active worker controls a ServiceWorkerClient if the client's URL falls within the scope of the registration (the scope option set when ServiceWorkerContainer.register is first called.)

Note: This feature is available in Web Workers.


sw = 


A ServiceWorker object, if it is currently in an activating or activated state.


Specification Status Comment
Service Workers
Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 40.0 44.0 (44.0)[1] 未实现 ? 未实现
Available in web workers (Yes) 44.0 (44.0)[1] 未实现 ? 未实现
Feature Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? 44.0 (44.0) (Yes) 未实现 ? 未实现 ?
Available in web workers ? (Yes) ? 未实现 ? 未实现 ?

[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)

See also


 此页面的贡献者: Stevenzwzhai
 最后编辑者: Stevenzwzhai,