我曾尝试过bootstrap模式，它的按钮不起作用。请帮忙谢谢你
我的代码不起作用：
<body>
<div class="quit_modal" tabindex="-1" role="dialog" data-toggle="modal" data-target="quit_model">
<div class="modal-dialog" id="delete-file-modal" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Modal title</h5>
<button type="button" class="btnClose" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div class="container-fluid">
<div class="row">
<div class="col-md-4 ml-2"></div>
<button type="button" class="btn btn-secondary"><a id="close" data-dismiss="modal" data-target="#quit_modal">Close</a></button>
<button type="button" class="btn btn-danger">Button</button>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="js/jquery-3.3.1.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<script type="text/javascript">
$("quit_Modal").modal('show');
$('btnClose').trigger('click');
</script>
</body>
您当前的选择器（“quit_Modal”和“btnClose”）没有类.或标识符#标志将引用标签，因此jQuery将在您的DOM中搜索名称为<quit_Modal>和<btnClose>的标签。
你错过了选择标志（点.和#）：
$("#quit_Modal").modal('show');
$('.btnClose').trigger('click');
注意：quit_Modal应该是id id="quit_Modal"。
jQuery(document).ready(function(e) {
$("#quit_Modal").modal('show');
setTimeout(function() {
$('.btnClose').trigger('click');
}, 1000);
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<div class="modal fade" id="quit_Modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Modal title</h4>
</div>
<div class="modal-body">
...
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default btnClose" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-danger">Button</button>
</div>
</div>
</div>
</div>你的选择器错了。
代替：
$("quit_Modal").modal('show');
$('btnClose').trigger('click');
用这个：
$(".quit_Modal").modal('show');
$('.btnClose').trigger('click');
$("quit_Modal").modal('show');
$('btnClose').trigger('click');
两者都是类，所以先把点（。）放在它之前......
$(".quit_Modal").modal('show');
$('.btnClose').trigger('click');