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下拉菜单控制层的显示与隐藏

2007-11-26 09:39 232 查看
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>
<head>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title> 新建网页 </title>
<style type="text/css">
#mylayer div{
display:none;
}
</style>
</head>
<body>
<select id="sel" onchange="f(this);">
<option> a </option>
<option> b </option>
<option> c </option>
<option> d </option>
</select>
<div id="mylayer">
<div style="display:block;"> 层1 </div>
<div> 层2 </div>
<div> 层3 </div>
<div> 层4 </div>
</div>
<script language="javascript">
function f(obj){
var mylayers = document.getElementById("mylayer").getElementsByTagName("DIV");

for(var i=0; i <mylayers.length; i++){
mylayers[i].style.display = "none";
}
mylayers[obj.selectedIndex].style.display = "block";
}
</script>
</body>
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