<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").dblclick(function(){
$("p").slideToggle();
});
});
</script>
</head>
<body>
<p>这是一个段落。</p>
<button>请双击此处</button>
</body>
</html>