Bootstrap implements pop-up windows
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>模态框</title>
<link rel="stylesheet" href="static/css/bootstrap.min.css">
</head>
<body>
<h2>创建模态框</h2>
<button class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">模态框</button><!--data-target="#myModal
"执行弹窗的div的id-->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">弹窗</h4><!--弹窗的标题-->
</div>
<div class="modal-body"><!--弹窗的内容-->
<p>弹窗的内容</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button><!--弹窗的尾部-->
<button type="button" class="btn btn-primary">保存</button>
</div>
</div>
</div>
</div>
<script src="static/js/jquery-3.5.1.min.js"></script>
<script src="static/js/bootstrap.min.js"></script>
</body>
</html>
Realize the effect: