javascript操作cookie

    function setCookie(name,value)    {        var Days = 30;        var exp  = new Date();        exp.setTime(exp.getTime() + Days*24*60*60*1000);        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();    }        function getCookie(name)    {        var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));        if(arr != null) {        return unescape(arr[2]);         } else {        return null;        }    }        function delCookie(name)    {        var exp = new Date();        exp.setTime(exp.getTime() - 1);        var cval=getCookie(name);        if(cval!=null) {        document.cookie= name + "="+cval+";expires="+exp.toGMTString();        }    }