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examples/dom/class.js

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+export const hasClass = function(obj, cls) {
+  return obj.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
+};
+
+export const addClass = function(obj, cls) {
+  if (!hasClass(obj, cls)) obj.className += ' ' + cls;
+};
+
+export const removeClass = function(obj, cls) {
+  if (hasClass(obj, cls)) {
+    const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
+    obj.className = obj.className.replace(reg, ' ');
+  }
+};
+
+export const toggleClass = function(obj, cls) {
+  if (hasClass(obj, cls)) {
+    removeClass(obj, cls);
+  } else {
+    addClass(obj, cls);
+  }
+};