我是渐进式网络应用程序的新手。我已经为我的 react PWA(渐进式 Web)应用程序完成了这个惊人的教程和设置。
现在这是我的serviceworker.js文件
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
window.location.hostname === '[::1]' ||
window.location.hostname.match(
/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
)
);
export default function register() {
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
if (publicUrl.origin !== window.location.origin) {
return;
}
window.addEventListener('load', () => {
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
if (isLocalhost) {
checkValidServiceWorker(swUrl);
navigator.serviceWorker.ready.then(() => {
});
} else {
registerValidSW(swUrl);
}
});
}
}
function registerValidSW(swUrl) {
navigator.serviceWorker
.register(swUrl)
.then(registration => {
registration.onupdatefound = () => {
const installingWorker = registration.installing;
installingWorker.onstatechange = () => {
if (installingWorker.state === 'installed') {
if (navigator.serviceWorker.controller) {
console.log('New content is available; please refresh.');
} else {
console.log('Content is cached for offline use.');
}
}
};
};
})
.catch(error => {
console.error('Error during service worker registration:', error);
});
}
function checkValidServiceWorker(swUrl) {
fetch(swUrl)
.then(response => {
if (
response.status === 404 ||
response.headers.get('content-type').indexOf('javascript') === -1
) {
navigator.serviceWorker.ready.then(registration => {
registration.unregister().then(() => {
window.location.reload();
});
});
} else {
registerValidSW(swUrl);
}
})
.catch(() => {
console.log(
'No internet connection found. App is running in offline mode.'
);
});
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready.then(registration => {
registration.unregister();
});
}
}
但无法理解它是如何工作的?任何人都可以帮忙在这里注册,取消注册和其他功能吗?
请帮忙!!!