auto save

my_client.py

@@ -86,6 +86,7 @@ def register():     # 注册验证
         content = json.dumps(users)
         with open("user.txt", "w", encoding="utf-8") as file:    # "w"每次写入都覆盖原来的内容
             file.write(content)
+        
         # 注册成功，跳往登陆界面
         messagebox.showinfo("成功", "注册成功")
         reg_to_login()