js实现双向链表互联网机顶盒实战应用实现

/*
* 链表节点
*/
Dare.LinkedListNode = function () {
this.data = null;//数据域
this.prev = null;//前驱
this.next = null;//后驱
};
Dare.extend(Dare.LinkedListNode, Dare);
Dare.LinkedListNode.prototype.getValue = function () {
return this.data;
};
Dare.LinkedListNode.prototype.setValue = function (obj) {
this.data = obj;
};
Dare.LinkedListNode.prototype.getPrev = function () {
return this.prev;
};
Dare.LinkedListNode.prototype.setPrev = function (node) {
this.prev = node;
};
Dare.LinkedListNode.prototype.getNext = function () {
return this.prev;
};
Dare.LinkedListNode.prototype.setNext = function (node) {
this.prev = node;
};

/*
* 双向链表
*/
Dare.LinkedList = function () {
this.head = null;
this.current = null;
this.tail = null;
this.length = 0;
};
Dare.extend(Dare.LinkedList, Dare);
/*
* 尾插法添加节点
*/
Dare.LinkedList.prototype.appendNode = function (node) {
if (this == null) return;
if (node == null) return;
var tail = this.tail;
if (tail == null) {
this.tail = this.head = node;
}
else {
tail.next = node;
node.prev = tail;
this.tail = node;
}
this.length++;
};
/*
* 删除节点
*/
Dare.LinkedList.prototype.moveNode = function (node) {
if (this == null) return;
if (node == null) return;
//中间节点
var prev = node.prev;
if (prev != null) {
prev.next = node.next;
}
if (node.next != null) {
node.next.prev = prev;
}
//头节点
if (node == this.head) {
this.head = node.next;
}
//尾节点
if (node == this.tail) {
if (prev != null) {
this.tail = prev;
}
else {
this.head = this.tail;
}
}
node.prev = null;
node.next = null;
this.length--;
};
/*
* 构造节点
*/
Dare.LinkedList.prototype.constructNode = function (node, obj) {
if (node == null || obj == null) return;
node.data = obj;
return node;
};
/*
* 获取节点数据
*/
Dare.LinkedList.prototype.getNodeData = function (node) {
if (node == null) return;
return node.data;
};
/*
* 从头开始
*/
Dare.LinkedList.prototype.start = function () {
if (this == null) return;
return this.current = this.head;
};
/*
* 从尾开始
*/
Dare.LinkedList.prototype.end = function () {
if (this == null) return;
return this.current = this.tail;
};
/*
* 下个节点
*/
Dare.LinkedList.prototype.nextNode = function () {
if (this == null) return;
if (this.current == null) return
var node = this.current;
this.current = this.current.next;
return node;
};
/*
* 上个节点
*/
Dare.LinkedList.prototype.prevNode = function () {
if (this == null) return;
if (this.current == null) return
var node = this.current;
this.current = this.current.prev;
return node;
};
/*
* 链表是否空
*/
Dare.LinkedList.prototype.isempty = function () {
if (this == null) return true;
if (this.head == null) {
return true;
}
else {
return false;
}
};
/*
* 链表长度
*/
Dare.LinkedList.prototype.getLength = function () {
if (this == null) return;
return this.length;
};
/*
* 清空链表
*/
Dare.LinkedList.prototype.clearList = function () {
this.head.next = null;
this.head = null;
};
/*
* 是否存在节点
*/
Dare.LinkedList.prototype.containsNode = function (obj) {
if (this == null) return false;
var node = list.head;
if (node == null) return false;
while (node != null) {
if (node.data == obj) {
return true;
}
node = node.next;
}
};

<script type="text/javascript">
var linkedList = new Dare.LinkedList();
function createList() {
for (var i = 0; i < 7; i++) {
var movie = {};
var linkedListNode = new Dare.LinkedListNode();
movie.id = i;
movie.name = 'movie_' + i;
linkedListNode.data = movie;
linkedList.appendNode(linkedListNode); //创建链表
}
//deleteNode(linkedList);//删除节点
//printList(linkedList); //输出链表
printNode(linkedList);
}
function printList(list) {
var node = list.head;
if (node == null) return;
var html = '';
while (node != null) {
var movie = node.data;
html += movie.id + "|" + movie.name + "<br>";
node = node.next;
}
document.write(html);
}
function deleteNode(list) {
var node = list.head;
if (node == null) return;
var i = 0;
while (node != null) {
if (i == 3) {
linkedList.moveNode(node); //删除指定节点
break;
}
i++;
node = node.next;
}
}
var printNode = function(list) {
var node = list.head;
if (node == null) return;
var i = 0;
while (node != null) {
if (i == 4) {
var movie = linkedList.getNodeData(node); //打印指定节点
document.writeln(movie.id + "<br>");
document.writeln(movie.name + "<br>");
break;
}
i++;
node = node.next;
}
}
</script>