ServiceWorkerContainer.controller
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.
当状态为activated 时， ServiceWorkerContainer 接口的只读属性 controller 返回一个 ServiceWorker 对象（与 ServiceWorkerRegistration.active 返回的对象是同一个）。当页面强制刷新 (Shift + refresh) 或不存在 active worder 时，该属性返回 null 。
语法
var myController = navigator.serviceWorker.controller;
值
一个ServiceWorker对象。
示例
js
if ("serviceWorker" in navigator) {
// Do a one-off check to see if a service worker's in control.
if (navigator.serviceWorker.controller) {
console.log(
"This page is currently controlled by:",
navigator.serviceWorker.controller,
);
} else {
console.log(
"This page is not currently controlled " + "by a service worker.",
);
}
} else {
console.log("Service workers are not supported.");
}
规范
| Specification |
|---|
| Service Workers # navigator-service-worker-controller |
浏览器兼容性
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