import tkinter as tk

window = tk.Tk()

window.title('Mywindow')

window.geometry('200x100')

var = tk.StringVar()

p= tk.Label(window,textvariable=var,bg='green',font=('Arial', 12),width=15, height=2)

p.pack()

on_hit = False

def hit_me():

        global on_hit

        if on_hit == False:

                on_hit = True

                var.set('You hit me!')

        else:

                on_hit = False

                var.set('I Love Python！ ')

b=tk.Button(window, text='点我',width=15,height=2,command=hit_me)

b.pack()

window.mainloop()

运行如上代码，对按钮点击二次后，在文本框中显示的文字为？ （ ）