<!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>
<title>Parent Page</title>
<script language="javascript" type="text/javascript">
function parenttest() {
alert("这是父页面的方法！");
}
function btnClick() {
document.getElementById("childframe").contentWindow.childtest();
}
</script>
</head>
<body>
<div style="margin:auto;">
<h1>This is the Parent Page.</h1>
<input type="button" value="调用子页面的方法" onclick="btnClick()"/>
</div>
<div style="margin:auto;">
<iframe style="width:300px; height:300px;" id="childframe" src="ChildPage.html"></iframe>
</div>
</body>
</html>
<!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>
<title>Child Page</title>
<script language="javascript" type="text/javascript">
function childtest() {
alert("这是子页面的方法！");
}
function btnClick() {
window.parent.parenttest();
}
</script>
</head>
<body>
<div style="margin:auto;">
<h1>This is the Child Page.</h1>
<input type="button" value="调用父页面的方法" onclick="btnClick()"/>
</div>
</body>
</html>
原文：http://www.cnblogs.com/jungege/p/6283349.html