navigator.serviceworker.controller仅在webroot中工作

我想得到一个 ServiceWorker 从名为 appdashboard …ServiceWorker安装、运行并从中可见 chrome://serviceworker-internals/ 但它的 Navigator.serviceWorker.controller 是空的,所以我无法与它通信。如果我不限制作用域(并将我的ServiceWorker文件移到webroot),它就可以正常工作。

   const serviceWorker = navigator
        .serviceWorker
        .register('appdashboard/dashboard_serviceworker.js', { scope: 'http://localhost/appdashboard/' })
        .then((swReg) => {
            console.log('[Service Worker (Dashboard)] service worker is registered', swReg);
            swRegistration = swReg;

            if (navigator.serviceWorker.controller != null) {
                console.log("controller is working")
            }

            if (navigator.serviceWorker.controller == null) {
                console.log("controller is NULL!") // <<<< its null :(
            }
    })

我简化了我的生活 serviceworker 尽可能多地诊断该问题,即使使用此裸机辅助,控制器也是空的。

self.addEventListener('message', function (event) { 
    console.log('got message')
});


self.addEventListener('activate', function (event) {
    console.log('serviceworker activate')
    event.waitUntil(self.clients.claim()); // Become available to all pages
});


self.addEventListener('install', function (event) {
    console.log('install')
});

self.addEventListener('fetch', function (event) {
    console.log('fetch')
});

self.addEventListener('push', (event) => {
    console.log('received push')
});

self.addEventListener('notificationclick', function (event) {
    console.log('registered notification click!')
});