本文实例讲述了JavaScript控制网页层收起和展开效果的方法。分享给大家供大家参考。具体如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><title>很酷的DIV层的展开收缩效果</title><style>* { margin:0; padding:0;}body {text-align:center;font:75% Verdana, Arial, Helvetica, sans-serif;}h1 {font:125% Arial, Helvetica, sans-serif;text-align:left; font-weight:bolder;background:#333; padding:3px;display:block; color:#99CC00}.class1 {width:40%; background:#CCC;position:relative; margin:0 auto;padding:5px;}span { position:absolute; right:10px;top:8px; cursor:pointer; color:yellow;}p { text-align:left; line-height:20px;background:#333; padding:3px; margin-top:5px;color:#99CC00}#class1content {height:300px;overflow:hidden}</style><script>function $(element){return element = document.getElementById(element);}function $D(){var d=$('class1content');var h=d.offsetHeight;var maxh=300;function dmove(){h+=50; //设置层展开的速度if(h>=maxh){d.style.height='300px';clearInterval(iIntervalId);}else{d.style.display='block';d.style.height=h+'px';}}iIntervalId=setInterval(dmove,2);}function $D2(){var d=$('class1content');var h=d.offsetHeight;var maxh=300;function dmove(){h-=50;//设置层收缩的速度if(h<=0){d.style.display='none';clearInterval(iIntervalId);}else{d.style.height=h+'px';}}iIntervalId=setInterval(dmove,2);}function $use(){var d=$('class1content');var sb=$('stateBut');if(d.style.display=='none'){$D();sb.innerHTML='收缩';}else{$D2();sb.innerHTML='展开';}}</script></head><body><div class="class1"><h1>DIV层的展开隐藏效果</h1><span id="stateBut" onclick="$use()">展开</span><p id="class1content">曾经有一份真诚的爱情放在我面前， <br>我没有珍惜，<br>等我失去的时候我才后悔莫及，<br>人世间最痛苦的事莫过于此。<br>如果上天能够给我一个再来一次的机会，<br>我会对那个女孩子说三个字：<br>我爱你。<br>如果非要在这份爱上加上一个期限，<br>我希望是……一万年！”</div></body></html>希望本文所述对大家的javascript程序设计有所帮助。
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