64 lines
1.9 KiB
JavaScript
64 lines
1.9 KiB
JavaScript
/**
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* Service Worker - PWA 离线支持
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* 缓存应用资源以便离线使用
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*/
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const CACHE_NAME = 'metona-ollama-v3';
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const ASSETS = [
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'./',
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'./index.html',
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'./style.css',
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'./chat-db.js',
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'./marked.esm.js',
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'./ollama-api.js',
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'./manifest.json'
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];
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// 安装阶段：预缓存核心资源
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches.open(CACHE_NAME)
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.then(cache => cache.addAll(ASSETS))
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.then(() => self.skipWaiting())
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);
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});
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// 激活阶段：清理旧缓存
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches.keys()
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.then(keys => Promise.all(
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keys.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))
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))
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.then(() => self.clients.claim())
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);
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});
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// 拦截请求：缓存优先，网络回退
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self.addEventListener('fetch', (event) => {
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// 不拦截非 GET 请求
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if (event.request.method !== 'GET') return;
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event.respondWith(
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caches.match(event.request)
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.then(cached => {
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if (cached) return cached;
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return fetch(event.request).then(response => {
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// 仅缓存成功的响应
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if (response && response.status === 200) {
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const clone = response.clone();
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caches.open(CACHE_NAME).then(cache => cache.put(event.request, clone));
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}
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return response;
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}).catch(() => {
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// 离线且无缓存时返回简单提示
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if (event.request.destination === 'document') {
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return new Response('离线模式：请检查网络连接', {
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headers: { 'Content-Type': 'text/plain; charset=utf-8' }
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});
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}
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});
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})
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);
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});
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