Make configuring baseURL easier and make the errors friendly (#9)

* feat(utils/request): make configuring baseURL easier

* docs(config/request): update the corresponding changes

5bc29f9200327de1d8aa23ab383bbd7f115db7ee

* feat(utils/request): make the errors friendly

I replaced the ugly if-statement with Map, and
I also make the message user-friendly
since this project is written for users, not only for developers.

And also, I removed the useless "alert", it is useless and annoying for users.

README.md

@@ -44,7 +44,7 @@ git clone https://github.com/qier222/YesPlayMusic.git
 npm install
 ```
 
-4. 替换 `/src/utils/request.js` 里面 `baseURL` 的值为网易云 API 地址
+4. 替换 `/src/config/request.js` 里面 `baseURL` 的值为网易云 API 地址
 
 ```JS
 baseURL: "http://example.com",

src/config/request.js

@@ -0,0 +1,6 @@
+/**
+ * The base url of your API.
+ * 
+ * The API can be found at https://github.com/Binaryify/NeteaseCloudMusicApi
+ */
+export const baseURL = "";

src/utils/request.js

@@ -1,31 +1,40 @@
 import axios from "axios";
+import { baseURL } from "@/config/request";
 
 const service = axios.create({
-  baseURL: "/api",
+  baseURL: baseURL,
   withCredentials: true,
   timeout: 15000,
 });
 
+const errors = new Map([
+  [401, 'The token you are using has expired.'],
+  [502, null],
+  [301, 'You must login to use this feature.'],
+  [-1, 'An unexpected error has occurred: '],
+]);
+
 service.interceptors.response.use(
   (response) => {
     const res = response.data;
+
     if (res.code !== 200) {
-      if (res.code === 401) {
+      alert(
-        alert("token expired");
+        errors.has(res.code)
-      } else if (res.code === 502) {
+          ? errors.get(res.code)
-        alert(res.msg);
+            // null = `The server returned ${res.msg}`
-      } else if (res.code === 301) {
+            || `The server returned ${res.msg}`
-        alert("login required");
+          // -1 = default expection message
-      } else {
+          : errors.get(-1) + res.code
-        alert("unknown error");
+      );
-      }
     } else {
       return res;
     }
   },
   (error) => {
-    console.log("err" + error);
+    const errMsg = `error: ${error}`;
-    alert("err " + error);
+    console.log(errMsg);
+
     return Promise.reject(error);
   }
 );