利用粒子群算法（PSO）来优化BP神经网络的权值和阈值，可运行，fun.m是用来计算适应度（误差）值的，在PSO.m中点击运行即可。-Using particle swarm optimization (PSO) to optimize the BP neural network weights and threshold, can run, fun.m is used to calculate the fitness value (error)