// 双向链表的有点，无论给出哪一个节点，都能对整个链表惊醒便利
    // 双向链表的缺点，多耗费一个引用的空间，而且构建的双向链表比较复杂

    function Node(value) {
    this.value;
    this.next = null;
    this.pre = null;
    }

    var node1 = new Node(1);
    var node2 = new Node(2);
    var node3 = new Node(3);
    var node4 = new Node(4);
    var node5 = new Node(5);

    node1.next = node2;

    node2.pre = node1;
    node2.next = ndoe3;

    node3.pre = node2;
    node3.next = ndoe4;

    node4.pre = node3;
    node4.next = ndoe5;

    node5.pre = node4;