jQuery selector not working as expected

I have this code:

alert (panes.selector); //gives me 开发者_如何学JAVA.css-panes .pane

var size = $(panes.selector).size(); 
alert (size); //gives me 0, confused I run the selector itself

var size = $(".css-panes .pane").size();
alert (size); //gives me 1 which is what I expect

What am I doing wrong?

Thank you.

SOLVED. Accidental (typo) use of panes instead of pane in the actual html. Sorry to everyone who spent time figuring this out.

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maybe it's type conversion problem

Try:

var size = $(panes.selector + "").size();