diff --git a/app.js b/app.js
index ee75e047db38c7c958c32dad77ad847946f3985a..a27b237d5025270d600bf85f1331ab242c2903b9 100644
--- a/app.js
+++ b/app.js
@@ -19,7 +19,7 @@ exec('npm info NeteaseCloudMusicApi version', (err, stdout, stderr) => {
 const app = express()
 
 // CORS
-app.use(function(req, res, next){
+app.use((req, res, next) => {
     if(req.path !== '/' && !req.path.includes('.')){
         res.header({
             'Access-Control-Allow-Credentials': true,
@@ -33,7 +33,7 @@ app.use(function(req, res, next){
 })
 
 // cookie parser
-app.use(function(req, res, next){
+app.use((req, res, next) => {
     req.cookies = {}, (req.headers.cookie || '').split(/\s*;\s*/).forEach(pair => {
         let crack = pair.indexOf('=')
         if(crack < 1 || crack == pair.length - 1) return
diff --git a/util/request.js b/util/request.js
index 97715d731ac825c032be69c74f1beadfbd5a0357..e797fa5d79dda2a5c1441a47473e05e478e3bfd9 100644
--- a/util/request.js
+++ b/util/request.js
@@ -4,7 +4,7 @@ const queryString = require('querystring')
 
 request.debug = true
 
-function chooseUserAgent(ua){
+const chooseUserAgent = (ua) => {
     const userAgentList = [
         'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1',
         'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1',
@@ -33,7 +33,7 @@ function chooseUserAgent(ua){
     return userAgentList[index]
 }
 
-function createRequest(method, url, data, options){
+const createRequest = (method, url, data, options) => {
     return new Promise((resolve, reject) => {
 
         let headers = {'User-Agent': chooseUserAgent(options.ua)}