iframe.html
<html>
<script src='jquerymin.js'>
</script>
<body id='1'>
<div>it is a iframe</div>
</body>
<script>
$(document).ready(
function()
{
var c = $(window.parent.document.body) //麻烦的方法： var c = $($(window).eq(0)[0].parent.document).find('body'); ，忘了可以用前面的方法了
alert(c.html());
}
);
</script>
</html>
content.html
<html>
<script src='jquerymin.js'>
</script>
<body id='fa'>
<iframe src='iframe.html' width='100' height='100'></iframe>
<br>
<br>
<br>
<div id='mydiv'>content iframe</div>
</body>
<script>
function a()
{
alert(1);
}
alert($(document).text());
</script>
</html>