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这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
ServiceWorker接口的这个只读的state属性返回一个代表service worker当前状态的字符串。值可以是以下这些：installing, installed, activating, activated, 或者是redundant.
语法
someURL = ServiceWorker.state
值
一个 ServiceWorkerState 的定义值 (see the spec.)
示例
这块代码出自 service worker registration-events sample (live demo). 代码监听了任何ServiceWorker.state中的改变，并返回它的值.
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);
});
}
规范
| 规范 | 状态 | 附注 |
|---|---|---|
| Service Workers state |
Working Draft | Initial definition |
浏览器兼容性
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
| 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 | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|---|
| Basic support | 未实现 | 未实现 | 44.0 (44.0) | (Yes) | 未实现 | ? | 未实现 | 40.0 |
[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)