ServiceWorker

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Service Worker APIServiceWorker 인터페이스는 서비스 워커로의 참조를 제공합니다. 다수의브라우징 맥락(e.g. 페이지, 다른 워커, 등등)는 고유한 ServiceWorker 객체를 통해 동일한 서비스 워커와 연결할 수 있습니다.

ServiceWorker 객체는 ServiceWorkerRegistration.active 속성과 ServiceWorkerContainer.controller 속성으로 접근할 수 있습니다. controller는 활성화되어 페이지를 통제 중인 서비스 워커입니다.

ServiceWorker 인터페이스에서는 일련의 생명주기 이벤트(install, activate)와 기능 이벤트(fetch)가 발생합니다. ServiceWorker 객체의 생명주기는 ServiceWorker.state 속성이 담고 있습니다.

속성

ServiceWorker 인터페이스는 부모 Worker에서 속성을 상속합니다.

ServiceWorker.scriptURL Read only
Returns the ServiceWorker serialized script URL defined as part of ServiceWorkerRegistration. The URL must be on the same origin as the document that registers the ServiceWorker.
ServiceWorker.state Read only
Returns the state of the service worker. It returns one of the following values: installing, installed, activating, activated, or redundant.

이벤트 처리기

ServiceWorker.onstatechange Read only
An EventListener property called whenever an event of type statechange is fired; it is basically fired anytime the ServiceWorker.state changes.

메서드

ServiceWorker 인터페이스는 부모 Worker에서 메서드를 상속합니다. 단, Worker.terminate()는 예외이며 서비스 워커에서 접근할 수 없습니다.

예제

This code snippet is from the service worker registration-events sample (live demo). The code listens for any change in the ServiceWorker.state and returns its value.

if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('service-worker.js', {
        scope: './'
    }).then(function (registration) {
        var serviceWorker;
        if (registration.installing) {
            serviceWorker = registration.installing;
            document.querySelector('#kind').textContent = 'installing';
        } else if (registration.waiting) {
            serviceWorker = registration.waiting;
            document.querySelector('#kind').textContent = 'waiting';
        } else if (registration.active) {
            serviceWorker = registration.active;
            document.querySelector('#kind').textContent = 'active';
        }
        if (serviceWorker) {
            // logState(serviceWorker.state);
            serviceWorker.addEventListener('statechange', function (e) {
                // logState(e.target.state);
            });
        }
    }).catch (function (error) {
        // Something went wrong during registration. The service-worker.js file
        // might be unavailable or contain a syntax error.
    });
} else {
    // The current browser doesn't support service workers.
}

명세

Specification Status Comment
Service Workers
The definition of 'ServiceWorker' in that specification.
Working Draft Initial definition.

브라우저 호환성

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
ServiceWorker
Experimental
Chrome Full support 40Edge Full support 17
Full support 17
Full support 16
Disabled
Disabled From version 16: this feature is behind the Enable service workers preference.
Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari Full support 11.1WebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS Full support 11.3Samsung Internet Android Full support 4.0
onstatechange
Experimental
Chrome Full support 40Edge Full support 17
Full support 17
Full support 16
Disabled
Disabled From version 16: this feature is behind the Enable service workers preference.
Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari Full support 11.1WebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS Full support 11.3Samsung Internet Android Full support 4.0
scriptURL
Experimental
Chrome Full support 40Edge Full support 17
Full support 17
Full support 16
Disabled
Disabled From version 16: this feature is behind the Enable service workers preference.
Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari Full support 11.1WebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS Full support 11.3Samsung Internet Android Full support 4.0
state
Experimental
Chrome Full support 40Edge Full support 17
Full support 17
Full support 16
Disabled
Disabled From version 16: this feature is behind the Enable service workers preference.
Firefox Full support 44
Notes
Full support 44
Notes
Notes Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
IE No support NoOpera Full support 27Safari Full support 11.1WebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 44Opera Android Full support 27Safari iOS Full support 11.3Samsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

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