Increase the font size with a click of a button using only JavaScript

Question

I\'m attempting to increase the font size with the click of a button. I have got the first one to work but I can\'t get my head around the second one. The second one, every

Answer 1

Cycle through different font sizes by clicking on an element

$(document).ready(function() {
  $("#ModelIDBarcode").click(function() {
    newFontSize = incSize($('.barcode').css("font-size"), 10, 5, 120)
    $('.barcode').css("font-size", newFontSize);
  });
});

function incSize(currentSize, incr, min, max) {
  fSize = (parseFloat(currentSize) + incr) % max + min;
  return (fSize) + 'px';
}

*ABarcodeValue*