用html和css实现标签折叠，代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>用html和css实现标签折叠</title>
</head>
<body>
<ul id="fm">
<li><a href="#"><h1>折叠标签A</h1>
<span>这里是描述标签A</span>
<span>这里是描述标签A</span>
<span>这里是描述标签A</span>
</a></li>
<li><a href="#"><h1>折叠标签B</h1>
<span>这里是描述标签B</span>
<span>这里是描述标签B</span>
<span>这里是描述标签B</span></a>
<li><a href="#"><h1>折叠标签C</h1>
<span>这里是描述标签C</span>
<span>这里是描述标签C</span>
<span>这里是描述标签C</span></a>
<li><a href="#"><h1>折叠标签D</h1>
<span>这里是描述标签D</span>
<span>这里是描述标签D</span>
<span>这里是描述标签D</span></a>
</ul>
</body>
</html>
CSS样式为：
<style type="text/css">
#fm{
overflow:hidden;
background-color:#FFCCCC;
width:200px;
height:500px;
overflow:hidden;
}
#fm h1{
margin:0px;
color:#FF3333;
font-size:14px;
}
#fm li{
list-sytle-type:none;
display:block;
width:178px;
border:1px solid #00CCCC;
border-bottom-width:0px;
}
#fm li.end{
border-bottom-width:1px;
}
#fm li a{
display:block;
text-decoration:none;
width:100%;
padding:10px;
}
#fm li a span{
display:none;
color:#000000;
font-size:12px;
padding-top:10px;
}
#fm li a:hover{
background:#fff;
}
#fm li a:hover span{
display:block;
cursor:hand;
}
</style>
效果如图：
以上就是用html和css实现标签折叠的解决方法。
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
#fm{
overflow:hidden;
background-color:#FFCCCC;
width:200px;
height:500px;
overflow:hidden;
}
#fm h1{
margin:0px;
color:#FF3333;
font-size:14px;
}
#fm li{
/* list-sytle-type:none; */
display:block;
width:178px;
border:1px solid #00CCCC;
border-bottom-width:0px;
}
#fm li.end{
border-bottom-width:1px;
}
#fm li a{
display:block;
text-decoration:none;
width:100%;
padding:10px;
}
#fm li a span{
display:none;
color:#000000;
font-size:12px;
padding-top:10px;
}
#fm li a:hover{
background:#fff;
}
#fm li a:hover span{
display:block;
cursor:hand;
}
</style>
</head>
<body>
<ul id="fm">
<li><a href="#"><h1>折叠标签A</h1>
<span>这里是描述标签A</span>
<span>这里是描述标签A</span>
<span>这里是描述标签A</span>
</a></li>
<li><a href="#"><h1>折叠标签B</h1>
<span>这里是描述标签B</span>
<span>这里是描述标签B</span>
<span>这里是描述标签B</span></a>
<li><a href="#"><h1>折叠标签C</h1>
<span>这里是描述标签C</span>
<span>这里是描述标签C</span>
<span>这里是描述标签C</span></a>
<li><a href="#"><h1>折叠标签D</h1>
<span>这里是描述标签D</span>
<span>这里是描述标签D</span>
<span>这里是描述标签D</span></a>
</ul>
</body>
</html>