J = K = 1 时，Qn+1 = Qn‘，即触发器翻转。J = 1，K = 0 时，Qn+1 = 1 ；J = 0，K = 1 时，Qn+1 = 0 ；J = K = 0 时，Qn+1 = Qn ；J = K = 1 时，Qn+1 = Qn' ；
