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("")

 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()