js:    function set_cookie(key, val,now){        var exdate = new Date(now);        exdate.setDate(exdate.getDate() + 30);        exdate = exdate.toGMTString();        document.cookie = key +　'=' + val + ";path=/;domain=;expires=" + exdate;    }    function get_cookie(key){        var cookies = document.cookie.split(';'), val;        for (var i = 0; i < cookies.length; i++) {            if (cookies[i].indexOf(key) !== -1) {                val = cookies[i].split('=')[1];                break;            }        }        return val || null;    }函数直接调用即可node：    function set_cookie(key, val){        var exdate = new Date();        exdate.setDate(exdate.getDate() + 30);        exdate = exdate.toGMTString();        return key +　'=' + val + ";path=/;domain=;expires=" + exdate;    }    res.setHeader("Set-Cookie", [set_cookie()]);