直接上代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>影音先锋</title>
<!-- Bootstrap -->
<link rel="stylesheet" type="text/css" href="https://cdn.bootcss.com/bootstrap/3.0.0/css/bootstrap.min.css">
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<!--<script src="js/jquery.min.js"></script>-->
<script src="js/jquery-2.1.4.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="js/adaptIE/html5shiv.min.js"></script>
<script src="js/adaptIE/respond.min.js"></script>
<![endif]-->
<style>
</style>
</head>
<body>
<div class="container-fluid text-center">
<h2>遮罩层DEMO</h2>
<!-- 按钮触发模态框 -->
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
打开遮罩层
</button>
<!-- 模态框（Modal） -->
<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" id="myModalLabel">
遮罩层标题
</h4>
</div>
<div class="modal-body">
在这里添加一些文本
</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">
提交更改
</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal -->
</div>
</body>
</html>