qawork_ajax_action.php

<scrip>
	 $.ajax({
		type:'post',
		url : ajax_url,
		data: {
			action:'hello_ajax'
		},
		success: function (response) {
			consloe.log(responce);
		},
	});
</script>

<?php
// example of creating ajax action
qw_add_action('qw_ajax_hello_ajax', 'hello_ajax_function');
function hello_ajax_function(){
	echo 'Hello! this is ajax responce';
	
	// you must use this at end
	die();
}