取得iframe src属性的的值：
Html代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery</title>
<style type="text/css">
</style>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function (){
var dk = $(window.parent.document).find("#iframe_id").attr("src");
alert(dk);
});
</script>
</head>
<body>
<iframe id="iframe_id" name="iframe_name" src="http://www.baidu.com"></iframe>
</body>
</html>
