php-web-maker/preview/talk.html

Hello

<script>
	if (
		'serviceWorker' in navigator
	) {
		// Delay registration until after the page has loaded, to ensure that our
		// precaching requests don't degrade the first visit experience.
		// See https://developers.google.com/web/fundamentals/instant-and-offline/service-worker/registration
		window.addEventListener('load', function () {
			navigator.serviceWorker
				.register('service-worker.js')
				.then(function (reg) {
					// updatefound is fired if service-worker.js changes.
					reg.onupdatefound = function () {
						// The updatefound event implies that reg.installing is set; see
						// https://w3c.github.io/ServiceWorker/#service-worker-registration-updatefound-event
						var installingWorker = reg.installing;

						installingWorker.onstatechange = function () {
							/* eslint-disable default-case */
							switch (installingWorker.state) {
								case 'installed':
									console.log('New or updated content is available.', navigator.serviceWorker.controller);
									break;

								case 'redundant':
									console.error(
										'The installing service worker became redundant.'
									);
									break;
							}
						};
					};
				})
				.catch(function (e) {
					console.error('Error during service worker registration:', e);
				});
		});
	}

</script>


<script>
	console.log('controller', navigator.serviceWorker.controller)
	window.addEventListener('message', (e) => {
		console.log(88, e.data);
		if (navigator.serviceWorker.controller) {
			navigator.serviceWorker.controller.postMessage(e.data);
		} else {
			alert('Ooops, seems like your preview is denying updation. How about we slap a quick refresh on him?');
			location.reload();
		}
	});

</script>