如何使用javascript加速此导出数据功能

我有一个功能，用户可以导出数据库信息。但是，如果用户选择所有选项进行导出，则下载.csv文件需要1分钟或更长时间。我只包含if语句的一部分，在这里我提取所有数据

这是：

  function exportTheData() {
        //get the data for data array
        if(exportVolumeData == 1) {

            for(j=0; j<plantData1.length; j++) {

                i = plantData["MergeKey_lvl00"].indexOf(plantData1["MergeKey_lvl00"][j]);

                data.push(plantData["PlantName"][i]);

                if(statesExport == 1) {
                    countyindex = counties["CountyId"].indexOf(plantData["LocationId"][i]);
                    stateid = counties["StateId"][countyindex];
                    statename = states["StateName"][states["StateId"].indexOf(stateid)];

                    data.push(statename);
                }
                if(countyExport == 1) {
                    countyindex = counties["CountyId"].indexOf(plantData["LocationId"][i]);
                    countyname = counties["CountyName"][countyindex];

                    data.push(countyname);
                }
                if(basinsExport == 1) {
                    countyindex = counties["CountyId"].indexOf(plantData["LocationId"][i]);
                    subbasinid = counties["SubBasinId"][countyindex];
                    subbasinindex = basinSub["SubBasinId"].indexOf(subbasinid);
                    basinid = basinSub["BasinId"][subbasinindex];
                    basinindex = basin["BasinId"].indexOf(basinid);
                    basinname = basin["BasinName"][basinindex];

                    data.push(basinname);
                }           
                if(subBasinsExport == 1) {
                    countyindex = counties["CountyId"].indexOf(plantData["LocationId"][i]);
                    subbasinid = counties["SubBasinId"][countyindex];
                    subbasinindex = basinSub["SubBasinId"].indexOf(subbasinid);
                    subbasinname = basinSub["SubBasinName"][subbasinindex];

                    data.push(subbasinname);
                }           
                if(paddsExport == 1) {
                    countyindex = counties["CountyId"].indexOf(plantData["LocationId"][i]);
                    subpaddid = counties["SubPaddId"][countyindex];
                    subpaddindex = paddSub["SubPaddId"].indexOf(subpaddid);
                    paddid = paddSub["PaddId"][subpaddindex];
                    paddindex = padd["PaddId"].indexOf(paddid);
                    paddname = padd["PaddName"][paddindex];

                    data.push(paddname);
                }           
                if(subPaddsExport == 1) {
                    countyindex = counties["CountyId"].indexOf(plantData["LocationId"][i]);
                    subpaddid = counties["SubPaddId"][countyindex];
                    subpaddname = paddSub["SubPaddName"][paddSub["SubPaddId"].indexOf(subpaddid)];

                    data.push(subpaddname);
                }           
                if(fullNameExport == 1) {
                    companyindex = getCompanyInfo["MergeKey_lvl00"].indexOf(plantData["OperatorId"][i]);
                    fullname = getCompanyInfo["FullName"][companyindex];

                    data.push(fullname);
                }           
                if(shortNameExport == 1) {
                    companyindex = getCompanyInfo["MergeKey_lvl00"].indexOf(plantData["OperatorId"][i]);
                    shortname = getCompanyInfo["ShortName"][companyindex];

                    data.push(shortname);
                }           
                if(tickerExport == 1) {
                    companyindex = getCompanyInfo["MergeKey_lvl00"].indexOf(plantData["OperatorId"][i]);
                    ticker = getCompanyInfo["Ticker"][companyindex];

                    data.push(ticker);
                }

                volumeindex = plantData1["MergeKey_lvl00"].indexOf(plantData["MergeKey_lvl00"][i]);
                startdate = plantData1["MonthStartDate"][volumeindex];
                volumetypeindex = plantData2["VolumeTypeId"].indexOf(plantData1["VolumeTypeId"][j]);
                volumetype = plantData2["VolumeType"][volumetypeindex];
                volumeunit = plantData2["Unit"][volumetypeindex];
                volume = plantData1["Volume"][volumeindex];

                data.push(startdate);
                data.push(volumetype);
                data.push(volumeunit);
                data.push(volume);
            }

        /* * Convert our data to CSV string */
        var CSVString = prepCSVRow(titles, titles.length, '');
        CSVString = prepCSVRow(data, titles.length, CSVString);
        /* * Make CSV downloadable*/
        var downloadLink = document.createElement("a");
        var blob = new Blob(["\ufeff", CSVString]);
        var url = URL.createObjectURL(blob);
        downloadLink.href = url;
        downloadLink.download = "data.csv";
        /** Actually download CSV */
        document.body.appendChild(downloadLink);
        downloadLink.click();
        document.body.removeChild(downloadLink);
   }

---

你知道我该怎么加速吗？数据库中有6000多行数据。谢谢

更改数据。按。。到数据[data.length]=。。使功能更快。此外，我还为countyindex和companyindex创建了变量，而不是在同一个函数中多次调用它

此外，清理函数的最后一部分确实有帮助：

  /* * Convert our data to CSV string */
 var CSVString = prepCSVRow(titles, titles.length);
 CSVString += prepCSVRow(data, titles.length);

 /* * Make CSV downloadable*/
 var downloadLink = document.createElement('a'),
  blob         = new Blob(['\ufeff', CSVString]);

 downloadLink.href     = URL.createObjectURL(blob);
 downloadLink.download = 'data.csv';

 /** Actually download CSV */
 document.body.appendChild(downloadLink);
 downloadLink.click();
 document.body.removeChild(downloadLink);

---

考虑使用承诺（Assic JS）吗？或者多处理，你试过了吗？我没有试过codereview，但我会感谢你的！我刚刚提出了一个关于codereview的问题

  /* * Convert our data to CSV string */
 var CSVString = prepCSVRow(titles, titles.length);
 CSVString += prepCSVRow(data, titles.length);

 /* * Make CSV downloadable*/
 var downloadLink = document.createElement('a'),
  blob         = new Blob(['\ufeff', CSVString]);

 downloadLink.href     = URL.createObjectURL(blob);
 downloadLink.download = 'data.csv';

 /** Actually download CSV */
 document.body.appendChild(downloadLink);
 downloadLink.click();
 document.body.removeChild(downloadLink);