经典的五子棋游戏~~~

（1）实现五子棋人机对战和机机对战。并判断胜负，向胜者表示祝贺。

（2）实现了残局设置供用户选择挑战。

（3）可以在人机对战中选择先后手。

（4）实现了机器的AI。

（5）可以根据权重落子，使机器功能更加强大。

（6）越界提醒，使用户能避免因输入错误导致落子越界出棋盘

（7）用户可以悔棋。

（8）用户再下完一局后，可选择是否继续再来一盘，选择“否”-The classic backgammon game ~ ~ ~ (1) to achieve backgammon play against human and machine machine game. And determine the outcome, congratulations to the winner. (2) implementation of the pieces set for the user to select the challenge. (3) can be successively selected in the hand of man-machine battle. (4) to achieve the machine' s AI. (5) according to the weight Lazi, make the machine more powerful. (6) cross-border remind users to avoid out of bounds due to input error causes the board Lazi (7) the user can undo. (8) and then the next user after the completion of a Board may choose whether to come back one, select " No"