<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>change</title>
<script type="text/javascript" src="http://libs.baidu.com/jquery/2.0.3/jquery.min.js"></script>
<script type="text/javascript">
function change(){
if($("a").html()=="更多"){
$("a").html("简化");
$("li").show();
}else{
$("a").html("更多");
$("li.ch").hide();
}
}
</script>
</head>
<body>
<ul>
<li class="ex">1</li>
<li class="ex">2</li>
<li class="ex">3</li>
<li class="ex">4</li>
<li class="ch" style="display:none">5</li>
<li class="ch" style="display:none">6</li>
<li class="ex">7</li>
</ul>
<a id="link" href="javascript:change()">更多</a>
</body>