我无法在tkinter Python中更改按钮图像

import tkinter as tk
from PIL import ImageTk, Image

root = tk.Tk()
button = tk.Button(root)
button.pack()

image = Image.open("image.png")

image = image.resize((width, height), Image.ANTIALIAS)

button_image = ImageTk.PhotoImage(image)

button.config(image=button_image)

import tkinter as tk
from PIL import ImageTk, Image

def change_image():
    # 加载图片
    image = Image.open("new_image.png")
    # 调整尺寸
    image = image.resize((width, height), Image.ANTIALIAS)
    # 转换为按钮图像的格式
    button_image = ImageTk.PhotoImage(image)
    # 设置按钮图像
    button.config(image=button_image)
    # 更新按钮显示
    button.image = button_image

root = tk.Tk()
# 创建按钮
button = tk.Button(root, command=change_image)
button.pack()

# 加载初始图片
image = Image.open("image.png")
width, height = 100, 100
image = image.resize((width, height), Image.ANTIALIAS)
button_image = ImageTk.PhotoImage(image)
button.config(image=button_image)
button.image = button_image

root.mainloop()