共计 1014 个字符，预计需要花费 3 分钟才能阅读完成。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
.collapse-toggle{display: none;}
.content{
max-height: 0px;
overflow: hidden;
transition: all .3s;
}
.collapse-toggle:checked~.content{max-height: 250px;}
.collapse-toggle:checked ~label .show{display: none}
.collapse-toggle:not(:checked) ~label .not-show{display: none}
.collapse-item{
margin: 10px;
border-radius: 10px
}
</style>
<body>
<div class="collapse-item">
<input type="checkbox" id="collapse1" checked name="collapse" class="collapse-toggle"></input>
<label style="display: flex;" for="collapse1">
<div> 第一个 collapse</div>
<img class="not-show" style="width: 20px;height: 20px;" src="http://csdnimg.cn/cdn/content-toolbar/csdn-sou.png?v=1587021042">
<img class="show" style="width: 20px;height: 20px;" src="https://img-blog.csdnimg.cn/2019091813595558.png">
</label>
<div class="content">
这个是切换内容 <br/>
这个是切换内容 <br/>
这个是切换内容 <br/>
</div>
</div>
</body>
</html>
正文完
