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/internals/to-string.js

@@ -0,0 +1,9 @@
+'use strict';
+var classof = require('../internals/classof');
+
+var $String = String;
+
+module.exports = function (argument) {
+  if (classof(argument) === 'Symbol') throw new TypeError('Cannot convert a Symbol value to a string');
+  return $String(argument);
+};