var abc;
var zxc;
$("#checktext").on('click', function(e) {
  var text = document.getElementById("checktext").value,
    element = $("#checktext")[0],
    arr1 = text.split(" "),
    length = 0,
    selectIndex = element.selectionStart;
  if (selectIndex == 0) {
    abc = arr1.indexOf(arr1[0]);
    console.log(arr1.indexOf(arr1[0]));
    return abc;
  } else {
    for (var i = 0; i < arr1.length; i++) {
      length = length + arr1[i].length + 1;
      if (length == selectIndex) {
        zxc = i + 1;
        console.log(i + 1);
        return zxc;
        break;
      }
    }
  }
});
document.write(abc);
document.write(zxc);