Bootstap 4 Modal -在触发模式时执行匿名函数

<!-- HTML代码 -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  打开模态框
</button>

<!-- 模态框 -->
<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">
        <h5 class="modal-title" id="myModalLabel">模态框标题</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        模态框内容
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
        <button type="button" class="btn btn-primary">保存</button>
      </div>
    </div>
  </div>
</div>

<!-- JavaScript代码 -->
<script>
  $('#myModal').on('show.bs.modal', function () {
    // 在模态框显示之前执行的匿名函数
    console.log('模态框即将显示');
    // 执行其他自定义操作...
  });

  $('#myModal').on('shown.bs.modal', function () {
    // 在模态框显示之后执行的匿名函数
    console.log('模态框已显示');
    // 执行其他自定义操作...
  });
</script>