how to find links in nested iframes and append an on-click listener

how to find links in nested iframes and append an on-click listener

I have a page that can contain any number of iframes, and those iframes can contain their own iframes, etc. (SharePoint 2013 web parts). I don't know the IDs of the iframes ahead of time and can't control that. I also cannot control the class names. The iframes DO all reside in the same domain, so that part won't be a problem.

Is there a way to iterate through all of the iframes in a document, and all the children as described above, such that I can examine the links in each iframe and attach a "click" function to them (I'm trying to add Google Analytics)?

We have jQuery v1.11.1 available (also not under my control), but even some vanilla javascript that does this would be helpful if anyone's figured that out.

My guess is I need to use something like "$(selector).contents()" but I haven't been coding in javascript for a while, got dragged into the project and am under the gun to get it done yesterday.

Any help would be appreciated!!!