def insertDomain(self, domain, indegree=0, outdegree=0):
		'''增加一个域名'''
		cur = self.conn.cursor()
		cur.execute("INSERT INTO Domains VALUES (NULL,?,?,?)", (domain, indegree, outdegree))
		# 写入到文件中
		self.conn.commit()
def playcolors():
  while 1:
    global clearcolor
    clearcolor = [np.random.random(),0,0,0]
    time.sleep(0.1)
    refresh()