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• jQuery 1.x http://jsfiddle.net/FrKyN/
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• http://blog.jquery.com/2013/03/01/jquery-2-0-beta-2-released/
• http://blog.jquery.com/2013/01/15/jquery-1-9-final-jquery-2-0-beta-migrate-final-released/

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http://jsfiddle.net/xYhve/

HTML：

<frameset>

<frame id="f" />

</frameset>

<iframe id="i" />

JS：

alert($("#f").contents()[0]);

alert($("#i").contents()[0]);

I saw the any Version code of Jquery Core Js：

contents: function( elem ) {return jQuery.nodeName( elem, "iframe" ) ? ...

only check "iframe", no "frame" :(

This is not related to jQuery:

http://jsfiddle.net/timmywil/xYhve/2/show/

Replying to [comment:3 timmywil]:

This is not related to jQuery: http://jsfiddle.net/timmywil/xYhve/2/show/

?????? 真搞不懂你们的办事方式，明明是有问题的！