SOURCE

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

function NodeList() {
    this.head = new Node('head');
    this.find = find;
    this.fundPrev = fundPrev;
    this.findLast = findLast;
    this.insert = insert;
    this.show = show;
    this.remove = remove;

    function find(element) {
        var _node = this.head;
        while (_node.next != null) {
            console.log(_node);
            if (_node.next.element == element) { return element; }
            _node = _node.next;
        }
        return null;
    }

    function fundPrev() {

    }

    function findLast() {
        var _node = this.head;
        while (_node.next != null)
            _node = _node.next;
        return _node;
    }

    function insert(element) {
        var _node = new Node(element);
        var lastNode = this.findLast();
        lastNode.next = _node;
        _node.next = null;
    }

    function show() {
        var _node = this.head;
        while (_node.next != null) {
            console.log(_node.next.element);
            _node = _node.next;
        }
    }

    function remove(element) {
        var _node = this.head;
        var preNode = null;
        while (true) {
            if (_node.element == 'head' && _node.next == null) return false;
            if (_node.next.element == element) {
                preNode.next = _node.next.element.next;
                return true;
            }
            if (_node.next == null) return false;
            preNode = _node;
        }
        return false;
    }
}

var nl = new NodeList();
nl.insert(1);
nl.insert(2);
nl.insert(3);
console.log(nl.find(2));
nl.show();