fix reference to old 'hasClass' method

diff --git a/js/reveal.js b/js/reveal.js
index 6a3398313cdf4d094905f8db123a3370ade011f0..ff0c47a4172ac405d62fcefb9decc15d111765b4 100644 (file)
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -293,7 +293,7 @@ var Reveal = (function(){
                for( var i = 0, len = nodes.length; i < len; i++ ) {
                    var node = nodes[i];
                    
-                   if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !hasClass( node, 'roll' ) ) ) {
+                   if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !node.classList.contains( node, 'roll' ) ) ) {
                        node.classList.add( 'roll' );
                        node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
                    }