排除部分网页被缓存？

I'm using apache, varnish and w3 total cache on a wordpress site.

I have a range of random posts that get loaded into an element.

My page is being cached by varnish and there for this element loses its randomness, ideally I would like to exclude this element from varnish and any other cache if this means editing my apache.conf.

I would suggest using JS to load the element, and add a varnish VCL pass for the URL that is called by AJAX for the element.