diff --git a/src/utils/music/kg/api-direct.js b/src/utils/music/kg/api-direct.js
index 37e2b31..18b2df5 100644
--- a/src/utils/music/kg/api-direct.js
+++ b/src/utils/music/kg/api-direct.js
@@ -1,7 +1,8 @@
 import { httpFetch } from '../../request'
 import { timeout } from '../options'
 
-const api_test = {
+// https://github.com/listen1/listen1_chrome_extension/blob/master/js/provider/kugou.js
+export default {
   getMusicUrl(songInfo, type) {
     const target_url = `https://wwwapi.kugou.com/yy/index.php?r=play/getdata&hash=${songInfo.hash}&platid=4&album_id=${songInfo.albumId}&mid=00000000000000000000000000000000`
     const requestObj = httpFetch(target_url, {
@@ -19,5 +20,3 @@ const api_test = {
     return requestObj
   },
 }
-
-export default api_test
diff --git a/src/utils/music/kw/api-direct.js b/src/utils/music/kw/api-direct.js
index 9e6a24b..d0a670d 100644
--- a/src/utils/music/kw/api-direct.js
+++ b/src/utils/music/kw/api-direct.js
@@ -1,7 +1,7 @@
 import { httpFetch } from '../../request'
 import { timeout } from '../options'
 
-const api_test = {
+export default {
   getMusicUrl(songInfo, type) {
     const target_url = `http://www.kuwo.cn/api/v1/www/music/playUrl?mid=${songInfo.songmid}&type=music&httpsStatus=1`
     const requestObj = httpFetch(target_url, {
@@ -21,5 +21,3 @@ const api_test = {
     return requestObj
   },
 }
-
-export default api_test
diff --git a/src/utils/music/mg/api-direct.js b/src/utils/music/mg/api-direct.js
index 29c6437..984d5a7 100644
--- a/src/utils/music/mg/api-direct.js
+++ b/src/utils/music/mg/api-direct.js
@@ -1,6 +1,8 @@
 import { httpFetch } from '../../request'
 import { timeout } from '../options'
 
+// https://github.com/listen1/listen1_chrome_extension/blob/master/js/provider/migu.js
+
 const qualitys = {
   '128k': 'PQ',
   '320k': 'HQ',
@@ -8,7 +10,7 @@ const qualitys = {
   flac32bit: 'ZQ',
 }
 
-const api_test = {
+export default {
   getMusicUrl(songInfo, type) {
     const quality = qualitys[type]
     const target_url = `https://app.c.nf.migu.cn/MIGUM2.0/strategy/listen-url/v2.2?netType=01&resourceType=E&songId=${songInfo.songmid}&toneFlag=${quality}`
@@ -33,5 +35,3 @@ const api_test = {
     return requestObj
   },
 }
-
-export default api_test
diff --git a/src/utils/music/tx/api-direct.js b/src/utils/music/tx/api-direct.js
index 730070f..e77e338 100644
--- a/src/utils/music/tx/api-direct.js
+++ b/src/utils/music/tx/api-direct.js
@@ -1,6 +1,8 @@
 import { httpFetch } from '../../request'
 import { timeout } from '../options'
 
+// https://github.com/listen1/listen1_chrome_extension/blob/master/js/provider/qq.js
+
 const fileConfig = {
   '128k': {
     s: 'M500',
@@ -19,7 +21,7 @@ const fileConfig = {
   },
 }
 
-const api_test = {
+export default {
   getMusicUrl(songInfo, type) {
     const target_url = 'https://u.y.qq.com/cgi-bin/musicu.fcg'
     // thanks to https://github.com/Rain120/qq-music-api/blob/2b9cb811934888a532545fbd0bf4e4ab2aea5dbe/routers/context/getMusicPlay.js
@@ -73,5 +75,3 @@ const api_test = {
     return requestObj
   },
 }
-
-export default api_test
diff --git a/src/utils/music/wy/api-direct.js b/src/utils/music/wy/api-direct.js
index d6fa43d..1cef16a 100644
--- a/src/utils/music/wy/api-direct.js
+++ b/src/utils/music/wy/api-direct.js
@@ -2,6 +2,8 @@ import { httpFetch } from '../../request'
 import { timeout } from '../options'
 import { eapi } from './utils/crypto'
 
+// https://github.com/listen1/listen1_chrome_extension/blob/master/js/provider/netease.js
+
 const qualitys = {
   '128k': 128000,
   '320k': 320000,
@@ -10,7 +12,7 @@ const qualitys = {
 
 let cookie = 'os=pc'
 
-const api_test = {
+export default {
   getMusicUrl(songInfo, type) {
     const quality = qualitys[type]
     const target_url = 'https://interface3.music.163.com/eapi/song/enhance/player/url'
@@ -42,5 +44,3 @@ const api_test = {
     return requestObj
   },
 }
-
-export default api_test