<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>测试</title>
<script language="javascript" type="text/javascript">
function getStyle() {
if (window.top == window.self) {
document.getElementById("top").style.display = 'block';
} else {
document.getElementById("top").style.display = 'none';
}
}
</script>
</head>
<body onload="getStyle();">
<form id="form1" runat="server">
<div id="top">
在框架中不显示，正常访问显示
</div>
</form>
</body>
</html>
当当前页面正常访问时显示div top
当当前页面在iframe中时页面不显示 div top