A页面：
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>A页面</title>
<script type="text/javascript">
function Afun()
{
alert('我是A页面的函数');
}
</script>
</head>
<body>
<div>
<h1>我是A页面</h1>
<div>
使用说明：
<p>配置host 127.0.0.1 parent.hc360.com</p>
<p>配置host 127.0.0.1 child.hc360.com</p>
</div>
<iframe id="frameB" src="http://child.hc360.com/iframe/B.html" width="650px"; height="500px";></iframe>
</div>
</body>
</html>
B页面：
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>B页面</title>
</head>
<body bgcolor="#CCCCCC">
<div>
<h1>我是B页面</h1>
<input id="button" type=button value="确定确定确定确定确定确定确定确定" onclick="send()"/>
</div>
<p><iframe id="frameC" name="frameC" src="" width="300px";height="30px";></iframe></p>
</body>
</html>
<script type="text/javascript">
function send(){
frameC.location.href="http://parent.hc360.com/iframe/C.html";
};
</script>
C页面：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>C页面</title>
<script type="text/javascript">
function init(){
top.Afun();
};
</script>
</head>
<body onload="init()" bgcolor="#999999">
<h1>我是C页面</h1>
</body>
</html>