SOURCE

//节点
function Node(element) {
    this.element = element;   //当前节点的元素
    this.next = null;         //下一个节点链接
}

//链表类
function LList () {
    this.head = new Node( 'head' );     //头节点
    this.find = find;                   //查找节点
    this.insert = insert;               //插入节点
    this.remove = remove;               //删除节点
    this.findPrev = findPrev;           //查找前一个节点
    this.display = display;             //显示链表
}

//查找给定节点
function find ( item ) {
    var currNode = this.head;
    while ( currNode.element != item ){
        currNode = currNode.next;
    }
    return currNode;
}

//插入节点
function insert ( newElement , item ) {
    var newNode = new Node( newElement );
    var currNode = this.find( item );
    newNode.next = currNode.next;
    currNode.next = newNode;
}

//显示链表元素
function display () {
    var currNode = this.head;
    while ( !(currNode.next == null) ){
        console.log( currNode.next.element );
        currNode = currNode.next;
    }
}

//查找带删除节点的前一个节点
function findPrev( item ) {
    var currNode = this.head;
    while ( !( currNode.next == null) && ( currNode.next.element != item )){
        currNode = currNode.next;
    }
    return currNode;
}

//删除节点
function remove ( item ) {
    var prevNode = this.findPrev( item );
    if( !( prevNode.next == null ) ){
        prevNode.next = prevNode.next.next;
    }
}

var fruits = new LList();

fruits.insert('Apple' , 'head');
fruits.insert('Banana' , 'Apple');
fruits.display()