auto save

my_app.py

 import tkinter
 from tkinter import messagebox
 import json
+
 with open("user.txt", "r", encoding="utf-8") as f:
     info = f.read()
     users = json.loads(info)
+
 def login_to_reg():    # 登录界面转注册界面
     app_login.root.destroy()
     global app_reg
@@ -18,7 +20,7 @@ def reg_to_login():   # 注册界面转登录界面
 
 def register():     # 注册验证
     name,password1,password2 = app_reg.get_input()
-    if name =="" or password1=="" or password2=="":
+    if name =="" or password2 == "" or password1=="":
         messagebox.showwarning("警告", "请填写完整的注册资料")
     elif name in users:
         messagebox.showwarning("错误", "用户名已经存在!")
@@ -27,14 +29,19 @@ def register():     # 注册验证
     else:
         users[name] = password1
         content = json.dumps(users)
-        with open("user.txt", "w", encoding="utf-8") as file:  
+        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")
-        login_show()
+        reg_to_login()
 
-def login():    # 登录验证
-    pass    
+def login():        # 登录验证
+    name, password = app_login.get_input()
+    pwd = users.get(name)
+    if pwd == password:
+        messagebox.showinfo("成功", "登录成功")
+    else:
+        messagebox.showwarning("错误", "用户名或密码错误!")
 
 class My_login():       # 登录窗口
     def __init__(self):
@@ -67,11 +74,10 @@ class My_login():       # 登录窗口
         button1 = tkinter.Button(self.root, text='登录', bg="lightblue",
                   fg="black", width=15, command=login)
         button1.place(x=60, y=220)
-        button1 = tkinter.Button(self.root, text='注册', bg="lightgreen",
+        button2 = tkinter.Button(self.root, text='注册', bg="lightgreen",
                   fg="black", width=15, command=login_to_reg)
-        button1.place(x=230, y=220)
-        # 进入消息循环，监听事件
-        self.root.mainloop()
+        button2.place(x=230, y=220)
+        self.root.mainloop()    # 进入消息循环，监听事件
 
     def get_input(self):      # 获取输入的用户名、密码
         self.name = self.e1.get()
@@ -115,9 +121,9 @@ class My_register():        # 注册窗口
         button1 = tkinter.Button(self.root, text='提交', bg="lightblue",
                   width=15,command=register)
         button1.place(x=230, y=250)
-        button1 = tkinter.Button(self.root, text='取消', bg="lightgreen",
+        button2 = tkinter.Button(self.root, text='取消', bg="lightgreen",
                   width=15, command=reg_to_login)
-        button1.place(x=80, y=250)
+        button2.place(x=80, y=250)
         # 进入消息循环
         self.root.mainloop()