<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<!--bootstrap要引入的文件：bootstrap.min.css,jquery.min.js,bootrap.min.js-->
<link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
<script src="js/jquery-1.11.0.js" type="text/javascript" charset="utf-8"></script>
<!--要在bootstrap之前引入jquery,bootstrap依赖JQUERY,因为bootstrapJS里要使用$这个jquery变量-->
<!--<script src="js/popper.js" type="text/javascript" charset="utf-8"></script>-->
<!--如果你要用bootstrap使用一些提示性的交互，那么就需要引入提示性的框架popper.js,因为bootstrap的提示就是依赖popper-->
<script src="js/bootstrap.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<p>
<a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" role="button">
Link with href
</a>
<!--
data-toggle:定义JS的切换功能的组件，collapse
data-target:定义要切换折叠的对象，属性值是相对应的ID,在A标签里面可以使用href属性代替
-->
<button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample" >
Button with data-target
</button>
</p>
<div class="collapse" id="collapseExample">
<div class="card card-body">
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</div>
</div>
</body>
</html>
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