更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/events/tests/errors.js

@@ -0,0 +1,13 @@
+'use strict';
+var assert = require('assert');
+var EventEmitter = require('../');
+
+var EE = new EventEmitter();
+
+assert.throws(function () {
+  EE.emit('error', 'Accepts a string');
+}, 'Error: Unhandled error. (Accepts a string)');
+
+assert.throws(function () {
+  EE.emit('error', { message: 'Error!' });
+}, 'Unhandled error. ([object Object])');