父域:www.parent.com iframe 域:www.iframe.com
<html>
<head></head>
<body>
<iframe id="trick" src="www.iframe.com/test">
<html>
<head></head>
<body>
<a href="www.test.com">test</a>
</body>
</html>
</body>
</html>
问题:如何使用jquery访问iframe内锚标记的href值?