function addClass1(element,value){        if(!element.className){            element.className = value;        }else{            newClassName = element.className;            newClassName += " ";            newClassName += value;            element.className =newClassName;        };    };    function addClass2(ele,className){        ele.className += " " + className;    };    function addClass3(node,className){        return node.className += " " + className;    };

   function removeClass2(ele,className){        var tmpClassName = ele.className;        ele.className = null;        ele.className = tmpClassName.split(new RegExp(" " + className + "|" + className + " " + "|" + "^" + className + "$","ig")).join("");    };    function removeClass3(node,className){        eles = node.className.split(/\s+/);//先将已有的class放进数组        for(var i = 0; i < eles.length; i++){            if(eles[i] == className){                eles.splice(i,1);//再遍历删除指定的class            };        };        node.className = eles.join("");//最后将新的数组用空格隔开重新添加回className        return node;    };