Ajax请求php查询

I am using cache plugin for wordpress website, Well I have few questions, actually I don't want plugin to cache the following php codes (the code is for ratings, download counts and page views.

<?php if(function_exists('the_ratings')) { the_ratings(); } ?>

<?php setPostViews($post->ID); ?>

<?php echo getDownloadCounter(get_the_ID()); ?>

The owner of plugin suggested to use Ajax requests.

Can anybody please how to adjust the above code in ajax? I am new to such things.

Thanks.