当模态即将被隐藏时，Bootstrap中的hide.bs.modal事件就会触发。
首先，在按钮单击时隐藏Bootstrap模式-
$("#button1").click(function(){
$("#newModal").modal("hide");
});现在，使用hide.bs.modal类，并在按钮单击时隐藏模式时生成警报-
$("#newModal").on('hide.bs.modal', function () {
alert('The modal is about to be hidden.');
});让我们看一个示例，说明hide.bs.modal事件的用法-
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
#button1 {
width: 140px;
padding: 20px;
bottom: 150px;
z-index: 9999;
font-size:15px;
position: absolute;
margin: 0 auto;
}
</style>
</head>
<body>
<div class="container">
<h2>Sample</h2>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<p>This is demo text.</p>
<button type="button" class="btn btn-default btn-lg" id="button1">Click to hide</button>
<div class="modal fade" id="newModal" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Sample Modal</h4>
</div>
<div class="modal-body">
<p>This is demo text.</p>
</div>
</div>
</div>
</div>
</div>
<script>
$(document).ready(function(){
$("#newModal").modal("show");
$("#button1").click(function(){
$("#newModal").modal("hide");
});
$("#newModal").on('hide.bs.modal', function () {
alert('The modal is about to be hidden.');
});
});
</script>
</body>
</html>