How can I call a php / wordpress command from JavaScript?

I'm trying to create a lightbox effect for a self-made WordPress Theme. But I'm trying to include a WordPress page in the body through jQuery.

For example, in my js file.

    $('.button').Click(function(){

    $(body).append('`<div><?php get_template_part('content','thing'); ?></div>`');

});

I've tryed that and then my php file doesn't reproduce the php bit.

Thanks.

via Chebli Mohamed