CodePen Embed - LgvdNW

<button class='counter'>0</button>
<button class='counter'>1</button>
<button class='counter'>5</button>
<button class='counter'>8</button>

$('.counter').on('click', function(e) {
  const oldValue = Number($(e.target).text()) || 0;

  $(e.target).text(oldValue + 1);
});

This Pen is owned by Ynon Perek on CodePen.

This Pen doesn't use any external CSS resources.