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-pure/modules/es.reflect.is-extensible.js

@@ -0,0 +1,13 @@
+'use strict';
+var $ = require('../internals/export');
+var anObject = require('../internals/an-object');
+var $isExtensible = require('../internals/object-is-extensible');
+
+// `Reflect.isExtensible` method
+// https://tc39.es/ecma262/#sec-reflect.isextensible
+$({ target: 'Reflect', stat: true }, {
+  isExtensible: function isExtensible(target) {
+    anObject(target);
+    return $isExtensible(target);
+  }
+});