有如下程序：import tkinter as

有如下程序：

import tkinter as tkwindow = tk.Tk()window.geometry('300x150')window.title('my first window')var = tk.StringVar() label = tk.Label(window, textvariable=var)label.pack()on_hit = Falsedef hit_me():    global on_hit    if on_hit == False:        var.set('You hit me')        on_hit = True    else:        var.set('')        on_hit = Falsebutton = tk.Button(window, text='hit me', width=15, height=1, command=hit_me)button.pack()window.mainloop()

下列说法不正确的是？（）