fix: 修复isLoggedIn未导出的错误

src/pages/index/index.vue

@@ -154,7 +154,7 @@
 </template>
 
 <script>
-import { isAdmin, isSales, isCustomer, isGuest, isLoggedIn, getUsername } from '@/utils/auth'
+import { isAdmin, isSales, isCustomer, isGuest, getUsername } from '@/utils/auth'
 
 export default {
   data() {
@@ -173,7 +173,7 @@ export default {
     isSales() { return isSales() },
     isCustomer() { return isCustomer() },
     isGuest() { return isGuest() },
-    isLoggedIn() { return isLoggedIn() }
+    isLoggedIn() { return !isGuest() }
   },
   onShow() {
     this.username = getUsername() || ''