气泡滑块onchange值触发警报不起作用？

Question

我正在使用气泡滑块，如果id的值更改其值，我想触发一个函数。

演示：https://www.jqueryscript.net/demo/Range-Slider-Plugin-jQuery-Bubble-Slider/

$(function() {
  $("#item_quantity").on('change', function() {
    alert("Works");
  })
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="col-md-12">
  <label class="">How many Email Newsletters would you like? </label>
  <div class="form-group  col-sm-12 col-md-12 col-lg-12">
    <input class="bubble-slider" name="item_quantity" id="item_quantity" placeholder="0 - 10" type="number" min="1" max="10" step="1" value="1" data-thumb-color="#1C8EC5" data-thumb-scale="0.5" data-track-scale="0.75">
  </div>
</div>