原来图片可以滚动的，只是在这个页面试不出来，我还特意把代码复制出去了
<!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>Hello World</title>
<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
<style>
.carousel {
height: 500px;
}
.carousel .item {
height: 500px;
}
.carousel .item img {
width: 100%;
}
</style>
</head>
<body>
<div id="ad-carousel" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#ad-carousel" data-slide-to="0" class="active"></li>
<li data-target="#ad-carousel" data-slide-to="1"></li>
<li data-target="#ad-carousel" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="item active">
<img src=" http://img1.sycdn.imooc.com//5412ad400001e52014280484.jpg" alt="1 slide">
<div class="container">
<div class="carousel-caption">
<p>11 英寸 MacBook Air 充电一次可运行长达 9 小时，而 13 英寸机型则可运行长达 12 小时。</p>
</div>
</div>
</div>
<div class="item">
<img src="http://img1.sycdn.imooc.com//5412ad7c0001d2eb10880541.jpg" alt="1 slide">
<div class="container">
<div class="carousel-caption">
<p>无论是什么任务，配备 Intel HD Graphics 5000 图形处理器的第四代 Intel Core 处理器都能应对自如。</p>
</div>
</div>
</div>
<div class="item">
<img src="http://img1.sycdn.imooc.com//5412ae5c0001653b12800644.jpg" alt="1 slide">
<div class="container">
<div class="carousel-caption">
<p> 有了新一代 802.11ac 技术，MacBook Air 令 Wi-Fi 速度超越极限。</p>
</div>
</div>
</div>
</div>
<a class="left carousel-control" href="#ad-carousel" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left"></span>
</a>
<a class="right carousel-control" href="#ad-carousel" data-slide="next">
<span class="glyphicon glyphicon-chevron-right"></span>
</a>
</div>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>
