小编vis*_*v.j的帖子

<a href="https://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_modal&stacked=h" id="leave">click here to leave the page</a>


<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Modal Header</h4>
      </div>
      <div class="modal-body">
        <p>Changes made may not be saved.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>

$("#leave").click(function() {
  $(window).bind('beforeunload', function() {
    return 'Changes you made may not be Saved';
  });
});

这是我工作的小提琴