二维FDTD程序，采用PML边界s 用pml和mur分别计算j=1处的Hz(i,1).计算空间扩大到400*400，不加边界，运行相同的时间步-2D FDTD procedures, Application of the PML's border with pml and mur calculated j = 1 Hz of (i, 1). for the space to expand to 400 * 400, without borders, running the same time step