import tkinter

def click_btn():
    text.insert(tkinter.END, '怪物出現了！')

root = tkinter.Tk()
root.title('輸入多列文字')
root.geometry('400x200')
button = tkinter.Button(text = '訊息', command = click_btn)
button.pack()
text = tkinter.Text()
text.pack()
root.mainloop()