diff --git a/book_manager.py b/book_manager.py
index 0feda8d..7ecdc03 100644
--- a/book_manager.py
+++ b/book_manager.py
@@ -4,9 +4,6 @@ from datetime import datetime
 
 class BookManager:
     
-    def __init__(self, data_file='books.json'):
-        """初始化图书管理器，加载已有图书数据"""
-        self.data_file = data_file
     
     def _load_books(self):
         """从文件加载图书数据"""