完善缓存

@@ -68,6 +68,9 @@ workboxSW = new self.WorkboxSW({
     skipWaiting: true
 });
 cacheFirstStrategy = workboxSW.strategies.cacheFirst({
+    cacheableResponse: {
+        statuses: [0, 200]
+    },
     cacheExpiration: {
         maxEntries: 1000,
         maxAgeSeconds: 7 * 24 * 60 * 60 // 7 day