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-background-sync/StorableRequest.js

@@ -0,0 +1,12 @@
+/*
+  Copyright 2021 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 './_version.js';
+// This is a temporary workaround to expose something from ./lib/ via our
+// top-level public API.
+// TODO: In Workbox v7, move the actual code from ./lib/ to this file.
+export { StorableRequest } from './lib/StorableRequest';