diff --git a/01.基础语法/04.装饰器.md b/01.基础语法/04.装饰器.md
index a3f7b57..a18f3e2 100644
--- a/01.基础语法/04.装饰器.md
+++ b/01.基础语法/04.装饰器.md
@@ -173,3 +173,74 @@ def f():
 f()
 ```
 
+# 小练习
+
+- 给前面的基于文件数据库的登录注册加上一个打游戏功能
+- 使用装饰器验证用户是否登录
+
+```python
+def check_auth(func):
+    def inner(name):
+        if len(flag) == 1:
+            func(name)
+        else:
+            print("没登录就别打游戏了！")
+    return inner
+
+@check_auth
+def play_game(name):
+    print(f"{name[0]}开始游戏")
+
+flag = []
+while True:
+    # 获取文件中保存的用户名和密码信息
+    dic = {}
+    with open("db", "a+", encoding="utf-8") as f:
+        f.seek(0)
+        temp_data = f.readlines()
+        for i in temp_data:
+            data = i.strip()
+            if len(data) == 0:
+                continue
+            temp_db = data.split("✨")
+            dic[temp_db[0]] = temp_db[-1]
+
+    # 登录注册的逻辑
+    print("登录".center(30,"="))
+    print("请选择：\n1.登录\n2.注册\n3.退出登录\n4.打游戏")
+    choice = input(">>>")
+    if choice == "1":
+        username = input("输入用户名：")
+        if username in dic.keys():
+            password = input("输入密码：")
+            if dic[username] == password:
+                print("\033[42;30m 登录成功！ \033[0m")
+                flag.append(username)
+            else:
+                print("\033[41;37m 密码错误 \033[0m")
+        else:
+            print("\033[41;37m用户名不存在！\033[0m")
+    elif choice == "2":
+        username = input("输入用户名")
+        if username in dic.keys():
+            print("\033[34;41m 用户名已存在！\033[0m")
+            continue
+        password = input("请输入密码")
+        dic[username] = password
+        print("\033[42;30m 注册成功！ \033[0m")
+    elif choice == "3":
+        flag.clear()
+        print("退出成功！")
+    elif choice == "4":
+        play_game(flag)
+    else:
+        print("\033[41;37m输入错误！\033[0m")
+
+    # 将数据写入文件
+    with open("db", "w+", encoding="utf-8") as f:
+        for k,v in dic.items():
+            data = f"{k}✨{v}\n"
+            f.write(data)
+
+```
+