Jquery一个slideToggle搞定div的隐藏与显示

<!DOCTYPE html>
<html>
<head>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script> 
$(document).ready(function(){
$("#flip").click(function(){
$("#panel").slideToggle("slow");
});
});
</script>

<style type="text/css"> 
#panel,#flip
{
padding:5px;
text-align:center;
background-color:#e5eecc;
border:solid 1px #c3c3c3;
}
#panel
{
padding:50px;
display:none;
}
</style>
</head>
<body>

<div id="flip">Click to slide the panel down or up</div>
<div id="panel">Hello world!</div>

</body>
</html>

原文：http://www.runoob.com/jquery/jquery-ref-selectors.html