JSON文档神秘地“清空”

我已经在Node.js中编写了一个小脚本来抓取网页并获取一些链接。报废部分由Cheerio完成。我的代码在这里（简化了空间）：

var request = require('request');
var cheerio = require('cheerio');

var base_url = 'http://www.naftemporiki.gr/finance/';

var mutuals = {};
mutuals.date = new Date();
mutuals.companies = [];

var company = {};  

request(base_url + 'mtfCompanies', function (error, response, html) {
    if (!error && response.statusCode == 200) {
        var $ = cheerio.load(html);

        $('.blueRow.texttd.name a').each(function (i, element) {
            var a = $(this);

            company = {};
            company.name = a.text();
            company.link = a.attr('href');

            mutuals.companies.push(company);
        });
    }
    //console.log(mutuals);          // 1st place
});
console.log(mutuals);                // 2nd place

这里是有趣的部分：当我尝试从“ request”块中的“第一个位置”输出JSON文档时，它确实不错。一个例子在这里：

{ date: Wed Nov 26 2014 10:35:09 GMT+0200 (EET),
  companies: 
   [ { name: ' J.P. MORGAN ASSET MANAGEMENT',
       link: 'mtfCompany?id=J.P.+MORGAN+ASSET+MANAGEMENT' },
     { name: ' BNP PARIBAS INVESTMENT PARTNERS',
       link: 'mtfCompany?id=BNP+PARIBAS+INVESTMENT+PARTNERS' },
     { name: ' PICTET', link: 'mtfCompany?id=PICTET' },
     { name: ' ALLIANZ ΑΕΔΑΚ',
       link: 'mtfCompany?id=ALLIANZ+%ce%91%ce%95%ce%94%ce%91%ce%9a' },
     { name: ' ALLIANZ ΑΕΔΑΚ (ΑΝΤΙΠΡ.)',
       link: 'mtfCompany?id=ALLIANZ+%ce%91%ce%95%ce%94%ce%91%ce%9a+(%ce%91%ce%9d%ce%a4%ce%99%ce%a0%ce%a1.)' },
     { name: ' ALLIANZ ΕΛΛΑΣ Α.Ε.',
       link: 'mtfCompany?id=ALLIANZ+%ce%95%ce%9b%ce%9b%ce%91%ce%a3+%ce%91.%ce%95.' }]}

当我尝试从ANY块之外并在执行结束时从“第二名”输出JSON文档时，这是我得到的：

{ date: Wed Nov 26 2014 10:35:09 GMT+0200 (EET), companies: [] }

看起来JSON文档中的'companies'数组已清空。我怀疑'mutuals.companies = [];' 由于某种原因，该行再次被执行。

有人能帮忙吗？

更新1：

按照建议将我的代码更改为使用“ async.series ...”。这是更新的版本：

var request = require('request'),
    async = require('async'),
    cheerio = require('cheerio');

var base_url = 'http://www.naftemporiki.gr/finance/';

var mutuals = {};
mutuals.date = new Date();
mutuals.companies = [];

var company = {};

async.series([
    function(callback) {
        request(base_url + 'mtfCompanies', function (error, response, html) {
            if (!error && response.statusCode == 200) {
                var $ = cheerio.load(html);

                $('.blueRow.texttd.name a').each(function (i, element) {
                    var a = $(this);

                    company = {};
                    company.name = a.text();
                    company.link = a.attr('href');

                    mutuals.companies.push(company);
                });
            }
        });
        callback(null, 'one');
    },
    function (callback) {
        console.log(mutuals);
        callback(null, 'two');
    }
]);

仍然无法正常工作。仍然输出的JSON是这样的：

{ date: Wed Nov 26 2014 10:35:09 GMT+0200 (EET), companies: [] }