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Navigator.serviceWorker 是个只读属性，返回 associated document 的 ServiceWorkerContainer 对象，这个对象提供注册、删除、更新以及和 ServiceWorker 通信的功能。
语法
var workerContainerInstance = navigator.serviceWorker;
值
规范
| Specification | Status | Comment |
|---|---|---|
| Service Workers navigator.serviceWorker |
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 | 24 | 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 | ? |
[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)