除了应该显示的图片和描述内容，为什么还显示了1 2 3？
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<style>
body{padding:10px;margin:10px;}
</style>
</head>
<body>
<div id="slidershow" class="carousel slide">
<!-- 设置图片轮播的顺序 -->
<ol class="carousel-indicators">
<li class="active" data-target="#slidershow" data-slide-to="0">1</li>
<li data-target="#slidershow" data-slide-to="1">2</li>
<li data-target="#slidershow" data-slide-to="2">3</li>
</ol>
<!-- 设置轮播图片 -->
<div class="carousel-inner">
<div class="item active">
<a href="##"><img src="http://images3.c-ctrip.com/rk/201407/ll580x145.jpg" alt=""></a>
<div class="carousel-caption">
<h3>图片标题1</h3>
<p>描述内容1...</p>
</div>
</div>
<div class="item">
<a href="##"><img src="http://images3.c-ctrip.com/dj/201408/zj/zj_580145.jpg" alt=""></a>
<div class="carousel-caption">
<h3>图片标题2</h3>
<p>描述内容2...</p>
</div>
</div>
<div class="item">
<a href="##"><img src="http://images3.c-ctrip.com/dj/201408/zqgq_580145.jpg" alt=""></a>
<div class="carousel-caption">
<h3>图片标题3</h3>
<p>描述内容3...</p>
</div>
</div>
</div>
<a class="left carousel-control" href="#slidershow" role="button">
<span class="glyphicon glyphicon-chevron-left"></span>
</a>
<a class="right carousel-control" href="#slidershow" role="button">
<span class="glyphicon glyphicon-chevron-right"></span>
</a>
</div>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script>
$(function(){
$("#slidershow").carousel({
interval:2000
});
$("#slidershow a.left").click(function(){
$("#slidershow").carousel("prev");
});
$("#slidershow a.right").click(function(){
$("#slidershow").carousel("next");
});
});
</script>
</body>
</html>
