function hasClass(node, className) {
            if (node && node.el) {
                return node.el.classList.contains(className);
            } else {
                return false;
            }
        }
function hasClass(node, className) {
            if (node && node.el) {
                return node.el.classList.contains(className);
            } else {
                return false;
            }
        }
function hasClass ( node , className ) { if ( node && node . el ) { return node . el . classList . contains ( className ) ; } else { return false ; } }
checking if className exists in node  @method hasClass @param {dom.Element} node @param {String} className @return boolean
checking if className exists in node