auto save

code.py

@@ -27,6 +27,7 @@ def register():     # 注册验证
     elif password1 != password2:
         messagebox.showwarning("错误", "两次密码不一致!")
     else:
+        
         users[name] = password1
         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