diff --git a/app/Models/Keyword.php b/app/Models/Keyword.php
index 44b4621..15489aa 100644
--- a/app/Models/Keyword.php
+++ b/app/Models/Keyword.php
@@ -32,7 +32,7 @@ class Keyword extends Model
                 $keyword->path = '-';
             } else {
                 // 将层级设为父类目的层级 + 1
-                $keyword->lv = $keyword->parent->lv ++;
+                $keyword->lv = $keyword->parent->lv +1;
                 $keyword->parent_key = $keyword->parent->key;
                 // 将 path 值设为父类目的 path 追加父类目 ID 以及最后跟上一个 - 分隔符
                 $keyword->path = $keyword->parent->path.$keyword->parent_id.'-';