{"book_id": "B001", "book_name": "Python编程", "quantity": 1, "date": "2026-03-25"},#{"book_id": "B002", "book_name": "数据结构", "quantity": 2, "date": "2026-03-26"}# 借书：输入书号和借阅数量，如果库存足够则减少库存，并添加一条借阅记录（包含书