此程序实现BP网络对异或地模拟，执行是没有错误的，但是时间过长的话，会出现debug 错误。虽然对程序本身的输出没有影响，但是让自己觉得不完善。-BP network to vary or simulation, the implementation is wrong, but the time is too long, there debug errors. While the process itself does not affect the output, but let thems