-爬虫多进程
for per in downlist:
threads = []
for url in per: # 开启多线程下载
filename = '%s/%s/%s.jpg' % (os.path.abspath('.'), dirName, k)
k = k + 1
t = Thread(target=self.download, args=[filename, url])
t.start()
threads.append(t)
for t in threads: # 开启守护进程
t.join()