struct linknode *subs(struct linknode *ha,struct linknode *hb)
{
    struct linknode *head=NULL,*p,*q;
    int a,flag;
    p = ha;
    //*********创建新链表所用变量*********
    int i=1;
    struct linknode *t,*s;
    //************************************
    while(p != NULL){
        flag = 0; //用于表示hb里面是否有等于该节点的值
        a = p->data;
        q = hb;
        while(q != NULL){
            if(q->data == a){
                flag = 1;
                break;
            }
            q = q->next;
        }
        if(flag == 0){  //hb里面没有该值，所以将a保存入新的链表
            if(i==1){
                head = (struct linknode*)malloc(sizeof(struct linknode));
                head->data = a;
                head->next = NULL;
                t = head;
            }
            else{
                s = (struct linknode*)malloc(sizeof(struct linknode));
                s->data = a;
                s->next = NULL;
                t->next = s;
                t = s;
            }
            i++;  //别漏了
        }
        p = p->next;
    }
    return head;
}