23 lines
1.0 KiB
JavaScript
23 lines
1.0 KiB
JavaScript
/* 数控销售工作台 离线缓存 Service Worker
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作用：托管(http/https)时缓存本应用，支持断网使用与“添加到桌面/安装为应用”。
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单文件 HTML 本身即可独立运行，此 SW 仅用于离线加速与桌面安装。 */
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const CACHE = "cnc-wb-v1";
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self.addEventListener("install", (e) => { self.skipWaiting(); });
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self.addEventListener("activate", (e) => { e.waitUntil(self.clients.claim()); });
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self.addEventListener("fetch", (e) => {
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if (e.request.method !== "GET") return;
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const url = new URL(e.request.url);
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if (url.origin !== location.origin) return; // 仅缓存同源资源
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e.respondWith((async () => {
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const cache = await caches.open(CACHE);
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const cached = await cache.match(e.request);
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try {
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const res = await fetch(e.request);
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if (res && res.status === 200) cache.put(e.request, res.clone());
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return res;
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} catch (_) {
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return cached || new Response("离线且本地无缓存", { status: 503, statusText: "Offline" });
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}
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})());
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});
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