auto save

my_app.py

 import tkinter
+from tkinter import messagebox
+import json
+
+with open("user.txt", 'r', encoding="utf-8") as file1:
+    info = file1.read()
+    users = json.loads(info)
 
 def login_to_reg():    # 登录界面转注册界面
-    pass
+    app_login.root.destroy()
+    global app_reg  #创建注册变量，并设为全局变量
+    app_reg = My_register()
+    app_reg.show()
 
 def reg_to_login():   # 注册界面转登录界面
-    pass
+    app_reg.root.destroy()
+    global app_login  #创建注册变量，并设为全局变量
+    app_login = My_login()
+    app_login.show()
 
 def register():     # 注册验证
-    pass
-
+    name, mima, mima2 = app_reg.get_input()
+    if name=="" or mima=="" or mima2=="":
+        messagebox.showwarning("警告","请填写完整的资料！")
+    elif name in users:
+        messagebox.showwarning("警告","用户名已存在！")
+    elif mima != mima2:
+        messagebox.showwarning("警告","两次密码不一致")
+    else:
+        users[name] = mima
+        content2 = json.dumps(content2)
+        with open("user.txt", 'w', encoding="utf-8") as file2:
+            file2.write(content2)
+        messagebox.showinfo("成功","注册成功")
+      
 def login():    # 登录验证
-    pass    
+    name,mima = app_login.get_input()    
+    mima2 = users.get(name)
+    if mima2 == mima:
+        messagebox.showinfo("成功","登录成功")
+    else:
+        messagebox.showerror("错误","用户名或密码错误")
 
 class My_login():       # 登录窗口
     def __init__(self):