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

function LinkedList(){
     this.head = new Node('head');
     this.find = find;
     this.insert = insert;
     this.remove = remove;
     this.show = show;
}

function find(item){
     var currentNode = this.head;//从头结点开始
     while(currentNode.element!=item){
         currentNode = currentNode.next;
     }
     return currentNode;//找到返回结点数据，没找到返回null
}

function insert(newElement,item){
     var newNode = new Node(newElement);
     var currentNode = this.find(item);
     newNode.next = currentNode.next;
     currentNode.next = newNode;
 }

function frontNode(item){
     var currentNode = this.head;
     while(currentNode.next.element!=item&¤tNode.next!=null){
         currentNode = currentNode.next;
     }   
     return currentNode;
}

function remove(item){
     var frontNode = this.frontNode(item);
     //console.log(frontNode.element);
     frontNode.next = frontNode.next.next;
 }

function show(){
     var currentNode = this.head,result;
     while(currentNode.next!=null){
         result += currentNode.next.element;//为了不显示head结点
         currentNode = currentNode.next;
     }
}

var list = new LinkedList();
list.insert("a","head");
list.insert("b","a");
list.insert("c","b");
console.log(list.show());
list.remove("b");
console.log(list.show());

function Node(element){
  this.element = element;
  this.next = null;
   this.front = null;
 }

function insert(newElement,item){
  var newNode = new Node(newElement);
  var currentNode = this.find(item);
  newNode.next = currentNode.next;
  newNode.front = currentNode;//增加front指向前驱结点
  currentNode.next = newNode;
}
function remove(item){  
  var currentNode = this.find(item);//找到需要删除的节点
  if (currentNode.next != null) {
    currentNode.front.next = currentNode.next;//让前驱节点指向需要删除的节点的下一个节点
    currentNode.next.front = currentNode.front;//让后继节点指向需要删除的节点的上一个节点
    currentNode.next = null;//并设置前驱与后继的指向为空
    currentNode.front = null;    
  }  
}

function findLast() {//查找链表的最后一个节点
  var currentNode = this.head;
  while (currentNode.next != null) {
    currentNode = currentNode.next;
  }
  return currentNode;
}

function showReverse() {
  var currentNode = this.head, result = "";
  currentNode = this.findLast(); 
  while(currentNode.front!=null){
    result += currentNode.element + " ";
    currentNode = currentNode.front;
  }
  return result;
}

var list = new LinkedList();
list.insert("a","head");
list.insert("b","a");
list.insert("c","b");
console.log(list);
list.remove("b");
console.log(list.show());
console.log(list.showReverse());

function LinkedList(){
  this.head = new Node('head');//初始化
  this.head.next = this.head;//直接将头节点的next指向头节点形成循环链表
  this.find = find;
  this.frontNode = frontNode;
  this.insert = insert;
  this.remove = remove;
  this.show = show; 
}

function find(item){
  var currentNode = this.head;//从头结点开始
  while(currentNode.element!=item&¤tNode.next.element!='head'){
    currentNode = currentNode.next;
  }
  return currentNode;//找到返回结点数据，没找到返回null
}
function show(){
  var currentNode = this.head,result = "";
  while (currentNode.next != null && currentNode.next.element != "head") {   
    result += currentNode.next.element + " ";
    currentNode = currentNode.next;
  }
  return result;
}

var list = new LinkedList();
list.insert("a","head");
list.insert("b","a");
list.insert("c","b");
console.log(list.show());
list.remove("b");
console.log(list.show());