实现模拟内存访问虚页面作业调度的fifo算法，如果内存有用户要访问的虚页，给出对应的实页号，如果没有就用fifo算法调入该虚页，并且给出对应的实页号-Analog memory access fifo virtual page job scheduling algorithm, if the memory the user wants to access the virtual page, given the corresponding physical page number, if not fifo algorithm transferred to the virtual pages, and gives the corresponding real page numbers