https://learn.javascript.ru/task/output-single-linked-list

"use strict";

var printListM = function(obj) {
    while (obj.next) {
        obj = obj.next;
    }
    alert(obj.value);
};

var printListR = function(obj) {
    alert(obj.value);
    if (obj.next != undefined) {
        printListR(obj.next);
    }
};

var list = {value: 1};
list.next = {value: 2};
list.next.next = {value: 3};
list.next.next.next = {value: 4};

printListR(list);