在javascript中访问用户会话数据的麻烦

这应该会很好:

var userId = JSON.parse(someObj.dataJSON || {}).user_id;

注意，这里的someObj是您在action, id, data等中的变量。

在服务器的响应中，您接收到一个字符串化的JSON对象，因此我们解析它，以接收一个真实的对象，而不是字符串。然后直接访问所需的属性

我已经找到了这个问题的答案。下面是parseUrl响应数组的最终输出，我想从dataJSON中提取数据。

parseUrl回应:

{
    action: 'write',
    id: 'biroh26adl9mc954nrrlf6bqm0',
    data: 'lang|O: 4: "I18n": 11: {
        s: 19: "'u0000CActiveRecord'u0000_new";b: 0;s: 26: "'u0000CActiveRecord'u0000_attributes";a: 9: {
            s: 2: "id";s: 1: "9";s: 9: "i18n_flag";s: 44: "ac84a0fd7788953be215d0c39e0f6475c5e02708.png";s: 9: "i18n_name";s: 5: "en_gb";s: 9: "i18n_code";s: 5: "en-gb";s: 14: "i18n_full_name";s: 10: "English-UK";s: 10: "is_default";s: 1: "1";s: 9: "is_active";s: 1: "1";s: 10: "created_at";s: 19: "2015-05-18 17:29:30";s: 10: "updated_at";s: 19: "2015-06-29 11:52:18";
        }s: 23: "'u0000CActiveRecord'u0000_related";a: 0: {
        }s: 17: "'u0000CActiveRecord'u0000_c";N;s: 18: "'u0000CActiveRecord'u0000_pk";s: 1: "9";s: 21: "'u0000CActiveRecord'u0000_alias";s: 1: "t";s: 15: "'u0000CModel'u0000_errors";a: 0: {
        }s: 19: "'u0000CModel'u0000_validators";N;s: 17: "'u0000CModel'u0000_scenario";s: 6: "update";s: 14: "'u0000CComponent'u0000_e";N;s: 14: "'u0000CComponent'u0000_m";N;
    }currency|O: 8: "Currency": 11: {
        s: 19: "'u0000CActiveRecord'u0000_new";b: 0;s: 26: "'u0000CActiveRecord'u0000_attributes";a: 8: {
            s: 2: "id";s: 1: "3";s: 13: "currency_name";s: 4: "Euro";s: 13: "currency_code";s: 3: "EUR";s: 14: "currency_signs";s: 3: "€";s: 10: "is_default";s: 1: "0";s: 9: "is_active";s: 1: "1";s: 10: "created_at";s: 19: "2015-05-06 14:16:01";s: 10: "updated_at";s: 19: "2015-05-06 14:16:54";
        }s: 23: "'u0000CActiveRecord'u0000_related";a: 0: {
        }s: 17: "'u0000CActiveRecord'u0000_c";N;s: 18: "'u0000CActiveRecord'u0000_pk";s: 1: "3";s: 21: "'u0000CActiveRecord'u0000_alias";s: 1: "t";s: 15: "'u0000CModel'u0000_errors";a: 0: {
        }s: 19: "'u0000CModel'u0000_validators";N;s: 17: "'u0000CModel'u0000_scenario";s: 6: "update";s: 14: "'u0000CComponent'u0000_e";N;s: 14: "'u0000CComponent'u0000_m";N;
    }user_id|i: 52;user_type|i: 3;user_email|s: 21: "laxman@mailinator.com";username|s: 3: "lax";iplocation|a: 11: {
        s: 10: "statusCode";s: 2: "OK";s: 13: "statusMessage";s: 0: "";s: 9: "ipAddress";s: 14: "103.240.34.199";s: 11: "countryCode";s: 2: "IN";s: 11: "countryName";s: 5: "India";s: 10: "regionName";s: 7: "Gujarat";s: 8: "cityName";s: 9: "Ahmedabad";s: 7: "zipCode";s: 6: "380028";s: 8: "latitude";s: 7: "23.0333";s: 9: "longitude";s: 7: "72.6167";s: 8: "timeZone";s: 6: "+05:30";
    }',
    time: '1444451442',
    dataJSON: '{
        "lang": {
        },
        "currency": {
        },
        "user_id": 52,
        "user_type": 3,
        "user_email": "laxman@mailinator.com",
        "username": "lax",
        "iplocation": {
            "statusCode": "OK",
            "statusMessage": "",
            "ipAddress": "103.240.34.199",
            "countryCode": "IN",
            "countryName": "India",
            "regionName": "Gujarat",
            "cityName": "Ahmedabad",
            "zipCode": "380028",
            "latitude": "23.0333",
            "longitude": "72.6167",
            "timeZone": "+05:30"
        }
    }'
}

解决代码:

var parseUrl = url.parse(req.url, true).query;
res.writeHead(200, {'Content-type': "text/plain"});
res.end(sessionHandler.run(parseUrl));
if ("string" === typeof (parseUrl.dataJSON)) {
    var _objUser = JSON.parse(parseUrl.dataJSON);        
    console.log(_objUser.user_id) // Response : 52
}