原生JS 添加或者删除某个class - 以为是帅哥

$S.addHandler($S.getId(fav[i]),\'mouseover\',function(){
                this.className += " "+\'S_hover\';
            });
            $S.addHandler($S.getId(fav[i]),\'mouseout\',function(){
                var reg = new RegExp(\'(\\s|^)\'+\'S_hover\'+\'(\\s|$)\');
                this.className=this.className.replace(reg,\' \');
            });