Setting, Getting value to input element  @method val @param {dom.Element} node @param? {String} val @return {String}
function val(node, _val2) {
            if (node && node.el) {
                var el = node.el;
                if (_val2 !== undefined) {
                    el.value = _val2;
                } else {
                    return el.value;
                }
            }
        }