import tkinter as tk
from tkinter import messagebox

def check_password():
    if username_entry.get() == "admin" and password_entry.get() == "password":
        messagebox.showinfo("登录成功", "欢迎使用MES系统！")
    else:
        messagebox.showerror("登录失败", "用户名或密码错误，请重试。")

root = tk.Tk()
root.title("MES系统")

username_label = tk.Label(root, text="用户名")
username_label.pack()

username_entry = tk.Entry(root)
username_entry.pack()

password_label = tk.Label(root, text="密码")
password_label.pack()

password_entry = tk.Entry(root, show="*")
password_entry.pack()

login_button = tk.Button(root, text="登录", command=check_password)
login_button.pack()

root.mainloop()