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<title>循环链表Circular linked list</title>
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<script>
/*
以下是循环链表中的构造方法（The following is the construction method in the circular list）
*****************************************************************************************
this.insert()=insert//插入链表中(insert the node to the LinkList)
this.lastNode()=lastNode//找到链表的最后一个节点(find the last node of LinkList)
this.forEach()=forEach//正向遍历( forward traversal)
this.forEachReverse()=forEachReverse//反向遍历(Reverse traversal)
this.find() = find;////寻找链表中的某个节点并返回其节点（Find a node in the list and return its node）
this.findPrevious()=findPrevious//寻找链表中的某个节点的前一个节点并返回其节点（Find a node's previus in the list and return its node）
this.remove() = remove;//移除链表中的某个节点（remove a node in the list)
this.insertAfter()=insertAfter // 向链表中某个节点后面插入一个节点（insert a node after a node in the list）
this.insertBefore()=inserBefore // 向链表中某个节点前面插入一个节点（insert a node before a node in the list）
this.advance()=advance //将某个节点向前移动n位（Move a node forward by n bits）
this.back ()=back // //将某个节点向后移动n位（Move a node backward by n bits）
*/
function Node(element) {
this.element = element;
this.next = null;
this.previous = null;
}
//循环链表Circular linked list
function LList() {
this.head=new Node('head');
//插入链表中(insert the node to the LinkList)
this.insert=function (element) {
//1,创建新的节点
var node = new Node(element);
//2,获得最后的节点
var lastNode = this.lastNode();
//3，和最后的节点连在一起
lastNode.next=node;
node.previous=lastNode;
this.head.previous=node;
node.next=this.head;
}
//找到链表的最后一个节点(find the last node of LinkList)
this.lastNode=function () {
if(this.head.next==null){
return this.head;
}
var lastNode = this.head;
while(lastNode.next.element!='head'){
lastNode = lastNode.next;
}
return lastNode;
}
//正向遍历( forward traversal)
this.forEach=function (call) {
if (this.head.next == null)
return;
var node = this.head.next;
while(node != null && node.element != 'head'){
call(node);
node=node.next;
}
}
//反向遍历(Reverse traversal)
this.forEachReverse=function (call) {
if (this.head.next == null)
return;
var lastNode = this.head.previous;
while(lastNode!=null&&lastNode.element!='head'){
call(lastNode);
lastNode= lastNode.previous;
}
}
//寻找链表中的某个节点并返回其节点（Find a node in the list and return its node）
this.find=function (element) {
if (this.head.next == null)
return null;
var node = this.head.next;
while(node.element!='head'&&node.element!=element){
node=node.next;
}
if(node.element=='head'){
return null;
}else{
return node;
}
}
//移除链表中的某个节点（remove a node in the list)
this.remove=function (element) {
//1,获得当前的节点
var node = this.find(element);
//2,获得当前节点的前一个节点
var preNode = node.previous;
//3,获得当前节点的后一个节点
var nextNode= node.next;
//4，链接节点
preNode.next=nextNode;
nextNode.previous = preNode;
}
// 向链表中某个节点后面插入一个节点（insert a node after a node in the list）
this.insertAfter=function (element,after) {
//1，找到当前的节点
var node =this.find(after);
if(null==node)
return -1;
//2,create the new node
var newNode = new Node(element);
//3,新节点和当前节点的后一个节点连在一起
node.next.previous=newNode;
newNode.next=node.next;
node.next=newNode;
newNode.previous=node;
return 1;
}
// 向链表中某个节点前面插入一个节点（insert a node before a node in the list）
this.insertBefore=function (element,before) {
//1，找到当前的节点
var node =this.find(before);
if('head'==node.element)
return -1;
//2,create the new node
var newNode = new Node(element);
//3,新节点和当前节点的前一个节点连在一起
newNode.previous=node.previous;
newNode.next=node.previous.next;
node.previous.next=newNode;
node.previous=newNode;
return 1;
}
//将链表中的某个节点向前移动n位（Move a node forward by n bits）
this.advance=function(currElement,n){
var currentNode=this.find(currElement);
var preNode=currentNode;
while(n>0){
preNode=preNode.previous;
if(preNode.element==currElement)
n++;
n--;
}
currentNode.next.previous=currentNode.previous;
currentNode.previous.next=currentNode.next;
currentNode.previous=preNode.previous;
currentNode.next=preNode.previous.next;
preNode.previous.next=currentNode;
preNode.previous=currentNode;
}
// //将链表中的某个节点向后移动n位（Move a node backward by n bits）
this.back=function(currElement,n){
var currentNode=this.find(currElement);
var preNode=currentNode;
while(n>0){
if(preNode.element==currElement)
n++;
preNode=preNode.next;
n--;
}
currentNode.next.previous=currentNode.previous;
currentNode.previous.next=currentNode.next;
currentNode.previous=preNode.previous;
currentNode.next=preNode.previous.next;
preNode.previous.next=currentNode;
preNode.previous=currentNode;
}
}
var list = new LList();
list.insert("你");
list.insert("好");
list.insert("明");
list.insert("天");
list.insert("!");
list.back('天',8);
list.forEach(function (node) {
console.log(node.element);
})
//console.log(list.find('天1'));
</script>
</html>循环链表、数据结构、节点移动