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<!Doctype html>
<head>
<meta charset="utf-8"/>
<style>
.nav {float: left;width: 200px;margin-right: 10px;}
.nav header{ padding-left: 15px; font-size: 18px; color: #ffffff; background: #6ABB78; line-height: 45px;}
.nav ul{border: 1px #cccccc solid; border-top: none;}
.nav dt{background: #efefef; font-size: 16px; padding-left: 15px; color: #666666; line-height: 35px; border-bottom: 1px solid #ffffff; cursor: pointer;}
.nav dd{display: none;padding-left: 15px;}
.nav dd a{color: #666666; line-height: 30px; font-size: 14px;}
</style>
</head>
<body>
<h1>一个定义列表:</h1>
<nav class="nav">
<header>3333</header>
<ul>
<li><dl>
<dt>css网站</dt>
<dd>网址为www.divcss5.com</dd>
<dd>网址为www.divcss5.com</dd>
<dd>网址为www.divcss5.com</dd>
</dl>
</li>
<li><dl>
<dt>css网站2</dt>
<dd>22222</dd>
<dt>3333333</dt>
</dl>
</li>
</nav>
<button type='button' onclick='toggle()'>toggle</button>
<script src="https://unpkg.com/jquery@3.4.1/dist/jquery.min.js"></script>
<script type="text/javascript">
function toggle(){
$('dt').toggle()
}
</script>
</body>
</html>
$('dt').on('click',()=>{
$("dd").css('display')=='none'
?$("dd").slideDown("slow")
:$("dd").slideUp("slow");
})