线程中t.setdaemon(), t.jion(), t.start的使用

import threading
import time
def f0():
    pass
def f1(a1,a2):
    time.sleep(10)
    f0()
    print("1")

t1 = threading.Thread(target=f1,args=(111,123))
# t.setDaemon(True)
t1.start()
t1.join(2)#等2秒
t2 = threading.Thread(target=f1,args=(111,123))
# t.setDaemon(True)
t2.start()
t2.join()#等待线程结束
t3 = threading.Thread(target=f1,args=(111,123))
# t.setDaemon(True)
t3.start()
t3.join()