我想问问 为什么我的模态被遮罩挡住了
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<!-- 链接bootstrap.min -->
<link href="bootstrap/bootstrap-3.3.5/dist/css/bootstrap.min.css" rel="stylesheet" type="text/css">
<style type="text/css">
#nav{
position:fixed;
}
.navbar-logo{
background:no-repeat url(img/logo.jpg) center center;
display:block;
width:96px;
height:50px;
}
.shop{
line-height:50px;
cursor:pointer;
color:#999;
margin:0px 20px;
}
.shop:hover{
color:#333;
}
.user{
line-height:50px;
cursor:pointer;
color:#999;
margin:0px 20px;
}
.user:hover{
color:#333;
}
.link{
margin-top:56px;
}
.thumbnail{
background:#CCC;
border:#333 2px solid;
height:360px;
}
.main{
margin-top:80px;
}
</style>
</head>
<body>
<!-- 导航 -->
<nav class="navbar navbar-default navbar-fixed-top" id="nav">
<div class="container">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-logo" href="#"></a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">我要开店</a></li>
<!-- 商品模态 -->
<li>
<button class="btn btn-primary" type="button">点击我</button>
<div class="modal fade" id="mymodal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 class="modal-title">模态弹出窗标题</h4>
</div>
<div class="modal-body">
<p>模态弹出窗主体内容</p>
</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">保存</button>
</div>
</div><!-- /.modal-content -->
</div><!-- /.modal-dialog -->
</div><!-- /.modal -->
</li>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="搜索商品">
</div>
<button type="submit" class="btn btn-default">搜索</button>
</form>
<li class="user"> 账号 <span class="glyphicon glyphicon-user"></li>
<li class="shop">购物车 <span class="glyphicon glyphicon-shopping-cart"></span></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</div><!-- /.container -->
</nav>
<!--内容-->
<div class="link">
<div class="container">
<ol class="breadcrumb">
<li><a href="#">我的亚马逊</a></li>
<li><a href="#">Z秒杀</a></li>
<li><a href="#">礼品卡</a></li>
<li><a href="#">海外购</a></li>
<li><a href="#">帮助</a></li>
<li><a href="#">IN ENGLISH</a></li>
</ol>
</div>
</div>
<!--banner-->
<div id="myCarousel" class="carousel slide">
<!-- 轮播（Carousel）指标 -->
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2">
<div id="myCarousel2" class="carousel slide">
<!-- 轮播（Carousel）指标 -->
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2"></li>
</ol>
<!-- 轮播（Carousel）项目 -->
<div class="carousel-inner">
<div class="item active"> <img src="../淘宝banner/bannertop.jpg" alt="First slide"> </div>
<div class="item"> <img src="../淘宝banner/banner.jpg" alt="Second slide"> </div>
<div class="item"> <img src="../淘宝banner/清凉一夏.jpg" alt="Third slide"> </div>
</div>
<!-- 轮播（Carousel）导航 -->
<a class="carousel-control left" href="#myCarousel" data-slide="prev"> <span class="glyphicon glyphicon-chevron-left"></span></a> <a class="carousel-control right" href="#myCarousel" data-slide="next"> <span class="glyphicon glyphicon-chevron-right"></span></a> </div>
</li>
</ol>
<!-- 轮播（Carousel）项目 -->
<div class="carousel-inner">
<div class="item active">
<img src="../淘宝banner/bannertop.jpg" alt="First slide">
</div>
<div class="item">
<img src="../淘宝banner/banner.jpg" alt="Second slide">
</div>
<div class="item">
<img src="../淘宝banner/清凉一夏.jpg" alt="Third slide">
</div>
</div>
<!-- 轮播（Carousel）导航 -->
<a class="carousel-control left" href="#myCarousel" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left"></span></a>
<a class="carousel-control right" href="#myCarousel" data-slide="next">
<span class="glyphicon glyphicon-chevron-right"></span></a>
</div>
<script type="text/javascript" src="bootstrap/bootstrap-3.3.5/js/jquery-3.0.0.min.js"></script>
<script type="text/javascript" src="bootstrap/bootstrap-3.3.5/dist/js/bootstrap.min.js"></script>
<script type="text/javascript" src="bootstrap/bootstrap-3.3.5/js/transition.js"></script>
<script type="text/javascript" src="bootstrap/bootstrap-3.3.5/js/modal.js"></script>
<script>
$(function(){
$(".btn").click(function(){
$("#mymodal").modal("toggle");
});
});
</script>
</body>
</html>
