fix

vite.config.ts

@@ -5,17 +5,18 @@ import AutoImport from "unplugin-auto-import/vite"
 import { NaiveUiResolver } from "unplugin-vue-components/resolvers"
 import Components from "unplugin-vue-components/vite"
 import Markdown from "unplugin-vue-markdown/vite"
-import { defineConfig } from "vite"
+import { defineConfig, loadEnv } from "vite"
 
-const url = process.env.VITE_OJ_URL
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd())
+  const url = env.VITE_OJ_URL
 
   const proxyConfig = {
     target: url,
     changeOrigin: true,
     headers: { Referer: url },
   }
-
-export default defineConfig({
+  return {
     build: {
       rollupOptions: {
         output: {
@@ -101,4 +102,5 @@ export default defineConfig({
         "/public": proxyConfig,
       },
     },
+  }
 })