Parse csv file to json object

CSVparse.js

//-read file-\\
  var openFile = function(file) {
    var reader = new FileReader();
    reader.onload = function(){
      var f= csvToJson(reader.result);
      echo(f);
    };
    reader.readAsText(file.target.files[0]);
  };
//-convert from tab delimited to json array on js-\\
  function csvToJson(data){
    var r = [];
    var t = data;
    var v = t.split("\r\n");
    for (var i = 0; i < v.length; i++) {
      var w = v[i].split("\t");
      g=[];
      for(j=0; j<w.length; j++){
        g.push(w[j]);
      }
      r.push(g);
    }
    return r;
  }
  function echo(f){
    console.log(f);
    document.querySelector('#echoDiv').innerHTML=JSON.stringify(f, null, 2);
  }
  //-select file-\\
  document.querySelector('html').innerHTML="<input type='file' onchange='openFile(event);document.querySelector(\"#refresh\").style.display=\"block\";'><br>";
  document.querySelector('html').innerHTML+="<input type='button'style='display:none' id='refresh' value='Refresh' onclick='echo()'><br><pre><code id='echoDiv'></code></pre>";