更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/core-js/modules/es.array.unscopables.flat.js

@@ -0,0 +1,7 @@
+'use strict';
+// this method was added to unscopables after implementation
+// in popular engines, so it's moved to a separate module
+var addToUnscopables = require('../internals/add-to-unscopables');
+
+// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
+addToUnscopables('flat');