更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/util.promisify/shim.js

@@ -0,0 +1,17 @@
+'use strict';
+
+var util = require('util');
+var getPolyfill = require('./polyfill');
+
+module.exports = function shimUtilPromisify() {
+	var polyfill = getPolyfill();
+	if (polyfill !== util.promisify) {
+		Object.defineProperty(util, 'promisify', {
+			configurable: true,
+			enumerable: true,
+			value: polyfill,
+			writable: true
+		});
+	}
+	return polyfill;
+};