Wordpress AJAX

functions.php

//of your theme...

function test_ajax()
{
  $pass = "empty";
  if( isset( $_POST['passthrough'] ) ){ $pass = $_POST['passthrough']; }
  die( json_encode( array("result"=>"true", "vars" => $pass) ) );
}

add_action( 'wp_ajax_nopriv_test_ajax', 'test_ajax' ); // if user is not logged in
add_action( 'wp_ajax_test_ajax', 'test_ajax' ); //if user is logged in

myscript.js

$('.deal-head-left').click(function(){
		$.ajax({
			url: 'http://162.243.11.26/wp-admin/admin-ajax.php',
			type: 'POST', dataType: 'json',
			data: { action: 'test_ajax', passthrough: 'Pass935JI'},
			success:function(data){
				console.log(data);
			}
		});
	});