feat: 新增ServiceWorker

_config.yml

@@ -227,7 +227,8 @@ firework:
 # Experimental, may have a lot of bugs, open with caution!
 pjax:
   enable: false
-
+serviceworker:
+  enable: true
 # Dependent cdn links
 vendor:
   js:

layout/_partial/head.ejs

@@ -64,4 +64,7 @@
           }).init();
         </script>
     <% } %>
+    <% if (theme.serviceworker.enable){ %>
+        <script src="/sw.js"></script>
+    <% } %>
 </head>

scripts/generator/servicework.js

@@ -0,0 +1,12 @@
+const fs = require('hexo-fs')
+let timeVersion = Date.now()
+
+hexo.extend.generator.register('ServiceWoker', function(locals){
+    let filePath = 'themes/reimu/source/js/sw.js'
+    let content = fs.readFileSync(filePath)
+    content = 'const VERSION = "'+ timeVersion +'";\n' + content
+    return {
+      path: "sw.js",
+      data: content,
+    }
+})

source/js/sw.js

@@ -0,0 +1,69 @@
+const PreCache = [
+  '/images/taichi.png',
+  '/images/banner.jpg',
+  '/images/taichi-fill.png',
+  '/css/loader.css',
+  '/css/style.css',
+  '/js/script.js'
+];
+
+// 安装时预加载必要内容
+self.addEventListener('install', (event) => {
+  console.log(`Service Worker ${VERSION} installing.`);
+  event.waitUntil(
+    caches.open(VERSION).then((cache) => {
+      return cache.addAll(PreCache);
+    })
+  );
+});
+
+self.addEventListener('fetch', function(event) {
+  // 检查请求是否为 POST 或带有查询参数的 GET 这样可用避免错误缓存
+  if (event.request.method === 'POST' || (event.request.method === 'GET' && event.request.url.indexOf('?') !== -1)) {
+    event.respondWith(fetch(event.request));
+  } else {
+    event.respondWith(
+      caches.match(event.request)
+        .then(function(response) {
+          if (response) {
+            return response;
+          }
+          return fetch(event.request).then(function(responseToCache) {
+            var responseToCacheClone = responseToCache.clone();
+            caches.open(VERSION).then(function(cache) {
+              cache.put(event.request, responseToCacheClone);
+            });
+            return responseToCache;
+          });
+        }
+      )
+    );
+  }
+});
+
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((cacheNames) => {
+      return Promise.all(
+        cacheNames.map((cacheName) => {
+          if (VERSION !== cacheName) {
+            console.log(`Service Worker: deleting old cache ${cacheName}`);
+            return caches.delete(cacheName);
+          }
+        })
+      );
+    })
+  );
+  console.log(`Service Worker ${VERSION} activated.`);
+});
+
+if ('serviceWorker' in navigator) {
+  navigator.serviceWorker.register('/sw.js')
+    .then((registration) => {
+      console.log('Service Worker 注册成功: ', registration);
+    })
+    .catch((error) => {
+      console.log('Service Worker 注册失败: ', error);
+    });
+}