print_r but for JavaScript

gistfile1.js

function obj2ul(obj) {
    var ul = document.createElement('ul');
    if ('object' == typeof obj) {
        for (var k in obj) {
            var li = document.createElement('li');
            if ('object' == typeof obj[k]) {
                li.appendChild(document.createTextNode(k + ':'));
                li.appendChild(obj2ul(obj[k]));
            } else {
                li.appendChild(document.createTextNode(k + ': ' + obj[k]));
            }
            ul.appendChild(li);
        }
        return ul;
    } else { return null; }
}