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假设双向链表结点结构包含指向前驱的prev指针和指向后继的next指针，且p所指结点不是链表尾结点。
q->prev = p; q->next = p->next; p->next->prev = q; p->next = q;
p->next = q; q->prev = p; q->next = p->next; p->next->prev = q;
q->next = p->next; p->next = q; q->prev = p; p->next->prev = q;
q->prev = p; p->next = q; q->next = p->next; p->next->prev = q;