如何在不重新加载页面的情况下重置Bootstrap模式窗口？使用PHP、jQuery、AJAX

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h4 class="modal-title" id="myModalLabel">Modal Title</h4>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        Modal Content
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  Open Modal
</button>

<div class="modal-body" id="modalContent">
  Modal Content
</div>

$(document).on('click', '.btn-primary', function() {
  $.ajax({
    url: 'reset_modal_content.php', // 替换为获取新内容的URL
    type: 'GET',
    success: function(response) {
      $('#modalContent').html(response);
    }
  });
});

<?php
// 处理获取新内容的逻辑
$newContent = "New Modal Content";
echo $newContent;
?>