var cache = {};
    var userId = datum.uniqueID;
   mysql.query('select accountID, deviceID, uniqueID from Device  WHERE uniqueID = ' + mysql.escape(userId),
        function(err, result, fields) {
            if (err) throw err;
            else {
                for (var i in result) {
                    var res = result[i];
                    cache.accountID = res.accountID;
                    cache.deviceID = res.deviceID;
                    console.log(result);                          //可以打印结果
                    console.log(cache.accountID);     //可以打印结果

                }
            }
        });

    console.log(result);                            //无法打印结果
    console.log(cache.accountID);           //无法打印结果

sipgear