Added html class functions to JS Performance

js/html-class-functions.js

@@ -0,0 +1,48 @@
+(function() {
+  var __elementPrototype;
+  __elementPrototype = Element.prototype;
+  /*!
+   * JavaScript hasClass|addClass|removeClass implementations.
+   * Copyright(c) 2011 Aaron Reisman <aaron@lifeiscontent.net>
+   * MIT Licensed
+   */
+
+  /**
+   * Return a `Boolean` from the given `className`.
+   *
+   * @param {String} className
+   * @return {Boolean}
+   * @api public
+   */
+
+  __elementPrototype.hasClass = function(className) {
+    var testStr;
+    className = ' '+className+' ';
+    testStr = ' '+this.className+' ';
+    return testStr.indexOf(className) > -1;
+  };
+
+  /**
+   * Return a `Boolean` from the given `className` that will be added.
+   *
+   * @param {String} className
+   * @return {Boolean}
+   * @api public
+   */
+
+  __elementPrototype.addClass = function(className) {
+    return (this.hasClass(className)) ? false : !!(this.className += ' '+className);
+  };
+
+  /**
+   * Return a `Boolean` from the given `className` that will be removed.
+   *
+   * @param {String} className
+   * @return {Boolean}
+   * @api public
+   */
+
+  __elementPrototype.removeClass = function(className) {
+    return (this.hasClass(className)) ? !!(this.className = this.className.replace(className, '')) : false;
+  };
+})();