1. 蛇移动的思想：

        其实就是删除头节点 ，增加尾节点；一句代码搞定

        struct Snake *p; p =head; head = head -> next; free(p)   防止造成多的空间节点

2.增加尾节点代码思想：

        2.1 .开辟new 节点的空间  struct Snake *new = (struct Snake *)malloc (sizeof(struct Snake));

        2.2 . 新节点的行 new ->hang = tail -> hang;

                新节点的列 new ->lie =tail -> lie+1;

                增加new节点 ：tail -> next = new; 

                新的尾巴        ： tail = new ;           

void addNode()
{
        struct Snake *new = (struct Snake *)malloc(sizeof(struct Snake));
        new -> hang = tail -> hang;
        new -> lie = tail -> lie+1;
 
        tail -> next = new;
        tail = new;
}


void deleteNode()
{
        struct Snake *p;
        p = head;
        head = head ->next;

        free(p);    // fang zhi zao cheng hen duo kong yu de jie dian
}

void moveSnake()
{
        struct Snake *p;
        struct Snake *new;

        addNode();
        deleteNode();
}
int main()
{
        int ctr;
        initNcurses();
        initSnakebody();

        gamePic();
        while(1){
                ctr = getch();
                if(ctr == KEY_RIGHT){
                        moveSnake();
                        gamePic();
                }
        }
        getch();
        endwin();
        return 0;
}