fix bug

fix when login cant open page setting

src/views/Setting.vue

@@ -111,7 +111,7 @@ const display_items = [
 export default {
   data() {
     return {
-      currentUser: JSON.parse(sessionStorage.getItem('current_user'))
+      currentUser: `${sessionStorage.getItem('current_user')}`
     };
   }
 };