<!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">
<title>现代浏览器模板</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<!--[if lt IE 9]>
<script src="js/html5shiv.js"></script>
<script src="js/respond.min.js"></script>
<![endif]-->
<style>
body{
padding-top: 50px;
padding-bottom: 50px;
}
.carousel{
height: 500px;
margin-bottom: 60px;
}
.carousel .item{
height: 500px;
background-color: #000;
}
.carousel .item img{
width: 100%;
background-color: #000;
}
.carousel-caption {
z-index: 10;
}
.carousel-caption p{
line-height: 1.8em;
font-size: 20px;
margin-bottom: 20px;
}
#summary-container .col-md-4{
text-align: center;
}
hr.divider{
margin: 40px 0;
}
.feature{
padding: 30px 0;
}
.feature-heading{
font-size: 50px;
color: #2a6496;
margin-top: 120px;
}
.feature-heading .text-muted{
font-size: 28px;
color: #999;
}
</style>
</head>
<body>
<div class="navbar navbar-default navbar-fixed-top navbar-inverse" role="navigation">
<div>
<!-- Brand and toggle get grouped for better mobile display -->
<div>
<button type="button" data-toggle="collapse" data-target="#demo-navbar">
<span>切换导航</span>
<span></span>
<span></span>
<span></span>
</button>
<a href="#">现代浏览器综述</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="demo-navbar">
<ul class="nav navbar-nav">
<li><a href="#carousel-example-generic">综述</a></li>
<li><a href="#tab-list">简述</a></li>
<li>
<a href="#" data-toggle="dropdown">特点
<span></span>
</a>
<ul role="menu">
<li><a href="#tab-chrome">Chrome</a></li>
<li><a href="#tab-firefox">Firefox</a></li>
<li><a href="#tab-safari">Safari</a></li>
<li><a href="#tab-opera">Opera</a></li>
<li><a href="#tab-ie">IE</a></li>
</ul>
</li>
<li><a href="#" data-toggle="modal" data-target="#about-modal">关于</a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
<!-- 关于 -->
<div class="modal fade" id="about-modal" tabindex="-1" role="dialog" aria-labelledby="modal-label"
aria-hidden="true">
<div>
<div>
<div>
<button type="button" data-dismiss="modal"><span
aria-hidden="true">×</span><span>关闭</span></button>
<h4 id="modal-label">关于</h4>
</div>
<div>
<p>慕课网隶属于北京慕课科技中心(有限合伙)，是一家从事互联网免费教学的网络教育公司。秉承“开拓、创新、公平、分享”的精神，
将互联网特性全面的应用在教育领域，致力于为教育机构及求学者打造一站式互动在线教育品牌。</p>
</div>
<div>
<button type="button" class="btn btn-default" data-dismiss="modal">了解了</button>
</div>
</div>
</div>
</div>
<!-- <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true" style="z-index:10600">
<div>
<div>
<div>
<button type="button" data-dismiss="modal"><span aria-hidden="true">×</span><span>关闭</span></button>
<h4 id="myModalLabel">关于</h4>
</div>
<div>
<p>慕课网隶属于北京慕课科技中心(有限合伙)，是一家从事互联网免费教学的网络教育公司。秉承“开拓、创新、公平、分享”的精神，
将互联网特性全面的应用在教育领域，致力于为教育机构及求学者打造一站式互动在线教育品牌。</p>
</div>
<div>
<button type="button" class="btn btn-default" data-dismiss="modal">了解了</button>
</div>
</div>
</div>
</div> -->
<script src="js/jquery-1.11.1.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script>
$(document).ready(function() {
$("#demo-navbar .dropdown-menu a").click(function() {
/* Act on the event */
var href = $(this).attr("href");
$("#tab-list a[href='" + href + "']").tab("show");
});
});
</script>
</body>
</html>老师，我想请问下，为什么我这个关于弹出框与背景变成黑底的了呢？找了好久也没找到原因，望解答
