1）在iframe中查找父页面元素的方法：
$('#id', window.parent.document)
2）在iframe中调用父页面中定义的方法和变量：
parent.method
parent.value
3）实例
1.父页面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="IframeDemo._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script language="javascript" type="text/javascript" src="jquery-1.5.1.min.js"></script>
<script language="javascript" type="text/javascript">
var hello = 'hello';
function getHelloWorld() {
alert('hello world');
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="default" style=" 200px; height:400px; float:left;">default.aspx</div>
<iframe id="iframeid" src="IFrame.aspx" style=" 400px; height:400px; float:left;"></iframe>
</div>
</form>
</body>
</html>
2.子页面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="IFrame.aspx.cs" Inherits="IframeDemo.IFrame" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script language="javascript" type="text/javascript" src="jquery-1.5.1.min.js"></script>
<script language="javascript" type="text/javascript">
$(function() {
//在iframe中查找父页面元素
alert($('#default', window.parent.document).html());
//在iframe中调用父页面中定义的方法
parent.getHelloWorld();
//在iframe中调用父页面中定义的变量
alert(parent.hello);
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="iframe">
IFrame.aspx
</div>
</form>
</body>
</html>