js实现双向链表互联网机顶盒实战应用实现_javascript技巧

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