为什么没有效果
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<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>
<style>
.carousel{
height:500px;
}
.carousel .item{
height:500px;
}
.carousel .item img{
width:100%;
}
</style>
<link href="//cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div id="myCarousel" class="carousel slide">
<!-- 轮播（Carousel）指标 -->
<ol>
<li data-target="#myCarousel" data-slide-to="0"></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>
<div class="item active">
<img src=" http://img.mukewang.com/5412ad400001e52014280484.jpg" alt="First slide">
<div>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</div>
</div>
<div>
<img src="http://img.mukewang.com/5412ad7c0001d2eb10880541.jpg" alt="Second slide">
<div>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</div>
</div>
<div>
<img src="http://img.mukewang.com/5412ae5c0001653b12800644.jpg" alt="Third slide">
<div>有了新一代 802.11ac 技术，MacBook Air 令 Wi-Fi 速度超越极限</div>
</div>
</div>
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data-slide="next">›</a></div>
<script src="//cdn.bootcss.com/jquery/3.2.1/core.js"></script>
<script src="//cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
</html>
用课程提供的jq和bootstrap链接有效果，但我用的是bootcdn bootstrap3.3.7版本的css和js文件和3.2.1的jq就没效果了，为啥
小公举丶默0回答
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慕瓜9220888
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