diff --git a/.env.development b/.env.development
index 5394d97..314af7e 100644
--- a/.env.development
+++ b/.env.development
@@ -1,3 +1,4 @@
 # NODE_ENV=development
 
-VUE_APP_API_HOST=http://localhost:3000
+VUE_APP_API_HOST=http://localhost:3000/
+VUE_APP_API_BACKUP=http://localhost:3000
diff --git a/README.md b/README.md
index 7989766..67b7ab1 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,21 @@
 # MusicBox
 
-A free music web app(desktop version) implemented by Vue.js, mimic of NetEase Music(https://music.163.com/), may be better, may be later ...
+A free music web app(desktop version) implemented by Vue.js, mimic of NetEase Music(https://music.163.com/).
 
 ## Deployment
 
 AWS EC2: http://ec2-54-191-119-231.us-west-2.compute.amazonaws.com:5600/
 
-## APIs and Icons used
+## Stack
 
-- Element-UI Components: https://element.eleme.io/
-- Netease Music API: https://github.com/Binaryify/NeteaseCloudMusicApi
-- Free Icons: https://www.iconfont.cn/
+- Vue + Vuex + Vue router
+- Flexbox/CSS grid layout
+- [Element-UI Components](https://element.eleme.io/)
+
+## APIs and icons used
+
+- [Netease Music API](https://github.com/Binaryify/NeteaseCloudMusicApi)
+- [Iconfont](https://www.iconfont.cn/)
 
 ## Project setup
 
@@ -20,7 +25,7 @@ npm install
 
 ### Prepare the backend
 
-To run the app, you need an API server, see [NeteaseCloudMusicApi](https://github.com/Binaryify/NeteaseCloudMusicApi).
+To run the app, you need to build your own API server, read [NeteaseCloudMusicApi](https://github.com/Binaryify/NeteaseCloudMusicApi).
 
 ### Compiles and hot-reloads for development
 
diff --git a/src/common/session.js b/src/common/session.js
new file mode 100644
index 0000000..f913597
--- /dev/null
+++ b/src/common/session.js
@@ -0,0 +1,24 @@
+export default {
+	setPageData: (key, dataObj) => {
+		let artist = JSON.stringify(dataObj);
+		sessionStorage.setItem(key, [artist]);
+	},
+
+	getPageData: (key) => {
+		return JSON.parse(sessionStorage.getItem(key));
+	},
+};
+
+// const setPageData = (key, dataObj) => {
+// 	let artist = JSON.stringify(dataObj);
+// 	sessionStorage.setItem(key, [artist]);
+// };
+
+// const getPageData = (key) => {
+// 	return JSON.parse(sessionStorage.getItem(key));
+// };
+
+// module.exports = {
+// 	setPageData,
+// 	getPageData,
+// };
diff --git a/src/store/index.js b/src/store/index.js
index 096997d..7396291 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -5,12 +5,14 @@ Vue.use(Vuex);
 
 export default new Vuex.Store({
 	state: {
+		// for music play
 		song: {
 			audioUrl: "",
 			picUrl: "",
 			name: "",
 			artist: "",
 		},
+		// for search results
 		curSearchTab: "tracks",
 	},
 	mutations: {},
diff --git a/src/views/playlists/PlaylistDetail.vue b/src/views/playlists/PlaylistDetail.vue
index d2a30a8..6a32a28 100644
--- a/src/views/playlists/PlaylistDetail.vue
+++ b/src/views/playlists/PlaylistDetail.vue
@@ -136,10 +136,9 @@ export default {
 				commentCount,
 			};
 
-			this.info.tags = data.playlist.tags; //array
-			console.log(data.playlist.tags);
-			this.tracks = [];
+			this.info.tags = data.playlist.tags; //tags is an array
 
+			this.tracks = [];
 			data.playlist.tracks.forEach((item) => {
 				let { name, id, dt: duration } = item;
 				duration = this.$helpers.convertMsToMinutes(duration);