我按照Andreas和Mosh Feu的评论编写了以下片段。 也许你能解释一下，什么东西在这里不起作用？

（我注释掉了$.post()部分，因为这在SO片段中不起作用。）

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$(document).ready(function() {
  var multipleCancelButton = new Choices('#choices-multiple-remove-button', {
    removeItemButton: true,
  });
});

$('#scrape').on('click', () => {
  var brands = $('#choices-multiple-remove-button option:selected');
  var specialty = [];
  brands.each(function(index, brand) {
    specialty.push($(this).val());
  });
  console.log(specialty);
  // $.post('/wellness', { 'specialty': specialty }, (res) => {});
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://res.cloudinary.com/dxfq3iotg/raw/upload/v1569006288/BBBootstrap/choices.min.css?version=7.0.0">
<script src="https://res.cloudinary.com/dxfq3iotg/raw/upload/v1569006273/BBBootstrap/choices.min.js?version=7.0.0"></script>
<div class="row d-flex justify-content-center mt-100">
  <div class="col-md-6">
    <select id="choices-multiple-remove-button" multiple>
      <option value="Acupuncturist" /> Acupuncturist</option>
      <option value="Holistic Care" /> Holistic Care</option>
      <option value="Naturopathic Doctor" /> Naturopathic Doctor</option>
    </select>
  </div>
  <button id="scrape">scrape</button>
</div>