<button class="save">Save 1</button>
<button class="save">Save 2</button>
<button class="save">Save 3</button>

<script>
  let saveBtn = document.getElementsByClassName('save');
  Array.from(save).forEach(function (el) { 
    el.addEventListener('click', handler) 
  });
  function handler() {
    console.log('Clicked');
  }
</script>