整理目录结构，加上publicPath

.env

@@ -1 +0,0 @@
-VUE_APP_URL_ROOT='/'

public/db.json

@@ -1,8 +0,0 @@
-{
-  "categories": [
-    {
-      "name": "computer",
-      "files": ["modern-full-stack.pdf", "gdb.pdf"]
-    }
-  ]
-}

src/App.vue

@@ -75,7 +75,7 @@ export default defineComponent({
   },
   async created() {
     const { data } = await axios.get(`${this.url_root}db.json`);
-    this.categories = data.categories;
+    this.categories = data;
   },
 });
 </script>

vue.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  publicPath: process.env.VUE_APP_URL_ROOT,
+};