js实现双向链表互联网机顶盒实战应用实现

上实战代码：
linkedlistnode.js 节点类

/* 
* 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; 
};

linkedlist.js 链表类

/* 
* 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; 
} 
};

实战调用用例代码陆续更新：

<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>