关闭modal前的保存/取消提示(当modal已通过ESC/ click-backdrop关闭时)

<!-- 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">
        <h4 class="modal-title" id="myModalLabel">编辑内容</h4>
      </div>
      <div class="modal-body">
        <!-- 编辑表单或其他内容 -->
        <input type="text" id="inputData" value="原始数据">
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
        <button type="button" class="btn btn-primary" id="saveBtn">保存</button>
      </div>
    </div>
  </div>
</div>

<!-- JavaScript代码 -->
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script>
$(document).ready(function() {
  var originalData = "原始数据";
  var currentData = "";

  // 监听模态框关闭事件
  $('#myModal').on('hide.bs.modal', function() {
    currentData = $('#inputData').val();

    // 判断是否需要提示
    if (originalData !== currentData) {
      // 弹出提示框
      var confirmed = confirm("是否保存已修改的内容？");
      if (confirmed) {
        // 执行保存操作
        saveData();
      }
    }
  });

  // 保存操作
  function saveData() {
    // 执行保存逻辑，例如发送请求保存数据

    // 关闭模态框
    $('#myModal').modal('hide');
  }
});
</script>