ServiceWorker.state
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2018年4月.
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。
js
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
| Specification |
|---|
| Service Workers # service-worker-state |
浏览器兼容性
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