Tkinter在线程处理时不退出

import tkinter as tk
import threading

def long_running_task():
    # 模拟耗时操作
    import time
    time.sleep(5)
    print("耗时操作完成")

def start_task():
    # 创建新线程来处理耗时操作
    thread = threading.Thread(target=long_running_task)
    thread.start()

def quit_app():
    # 退出应用程序
    root.quit()

root = tk.Tk()

# 创建按钮和退出按钮
start_button = tk.Button(root, text="开始任务", command=start_task)
start_button.pack()

quit_button = tk.Button(root, text="退出", command=quit_app)
quit_button.pack()

root.mainloop()