Ajax empty alert

Hi i’m trying to use ajax in my theme but i get an empty alert after it runs.
Here is my javascript code:

var $e=jQuery.noConflict();
$e(document).ready(function(){
$e(“#formCarrito2”).submit(function() {
var codigo = $e(“#formCarrito2 input[name=codice]”).val();
$e.ajax({
type: ‘POST’,
url: ‘http://www.myurl.com/wp-admin/admin-ajax.php’,
data: {
action: ‘agregar_carro’,
codigo: codigo,
},
success: function(data){
window.location.href = “http://www.romigroup.it/pre-carrello”;
$e(“.cantidad_confirm”).html(”);
$e(“.cantidad_confirm”).append(data);
},
error: function(MLHttpRequest, textStatus, errorThrown){
alert(errorThrown);
}
});
});
});

And here my functions.php function.

function agregar_carro(){
//get data from our ajax() call
$codigo = ‘<p>’.$_POST[‘codigo’].'</p>’;
echo $codigo;
die();
}
// create custom Ajax call for WordPress
add_action( ‘wp_ajax_nopriv_myAjax’, ‘agregar_carro’ );
add_action( ‘wp_ajax_myAjax’, ‘agregar_carro’ );