更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/workbox-recipes/index.js

@@ -0,0 +1,18 @@
+/*
+  Copyright 2020 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+import { googleFontsCache } from './googleFontsCache';
+import { imageCache } from './imageCache';
+import { staticResourceCache, } from './staticResourceCache';
+import { pageCache } from './pageCache';
+import { offlineFallback } from './offlineFallback';
+import { warmStrategyCache } from './warmStrategyCache';
+import './_version.js';
+/**
+ * @module workbox-recipes
+ */
+export { googleFontsCache, imageCache, offlineFallback, pageCache, staticResourceCache, warmStrategyCache, };