分享一则JavaScript滚动条插件源码

                return false;
            }
            if (elementClassName == className || elementClassName.match(new RegExp(“(^|s)” + className + “(s|$)”))) {
                return true;
            }
            return false;
        },
        addClass: function (element, className) {
            /// <summary>
            ///     1: 为元素【追加】class
            ///         1.1 – addClass(element,className) – 为元素【追加】class，并返回修改后的class
            /// </summary>
            /// <param name=”element” type=”Element Or String”>
            ///     节点对象
            /// </param>
            /// <param name=”className” type=”String”>
            ///     Class Name
            /// </param>
            /// <returns type=”Element” />
            if (!tool.hasClass(element, className)) {
                if (element.className.length < 1) {
                    element.className = className;
                } else {
                    element.className += ‘ ‘ + className;
                }
            }
            return element;