Add a header to a text without

<!DOCTYPE html>
<html>
  <head>
    <title>Archivos da itau</title>

    <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/accounting.js/0.4.1/accounting.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/datejs/1.0/date.min.js"></script>


    <script>
//File: myscript.js
$(function(){
  var dbid = "dbid";
  var dbidTable = "dbidtable";
  var apptoken = "apptoken";
  $.ajaxSetup({data: {apptoken: apptoken}});

  var parseFile = function(id) {
    return $.Deferred(function(dfd) {
      $("#" + id).on("change", function(){
          var reader = new FileReader();
          reader.onload = function () {

            var dsv = d3.dsv(";", "text/plain");//creates a parser with ";""
            var header = "Data_Mov;Historico;Valor"//creates a header cause text has no header
            var data = dsv.parse(header + "\n" + reader.result);
            dfd.resolve(data);
          };
        reader.readAsText(this.files[0]);
      });
    }).promise();
  };

  parseFile("myFile").then(function(data){

    var csv_array = [];
    console.log(JSON.stringify(data, null, "  "));
    data.forEach(function(row) {
      var csv_line = [];
      csv_line.push(row["Data_Mov"]);

      csv_line.push(row["Historico"]);
      csv_line.push(row["Valor"]);
      csv_line.push(row["Data_Mov"] + "-" + row["Historico"] + "-" + row["Valor"]);//creates a unique field


      csv_array.push('"' + csv_line.join('","') + '"');
    });
    console.log(csv_array.join("\n"));
alert("CONSOLA MIRA QUE BONITO");
    var csv_data = csv_array.join("\n");
    var promise = $.post(dbidTable, {
      act: "API_ImportFromCSV",
      records_csv: csv_data,
      clist: "7.9.11.18" //match Array order with fids of my table

    });

    $.when(promise).then(function(xml) {
      alert("yesss");
    console.dirxml(xml);// log para ver resultado da importacao
    });

  });
});


</script>
  </head>

  <body>
    <input type="file" id="myFile" accept=".txt">
  </body>
</html>