问Javascript/jquery ajax请求

EN

Javascript code: 
jQuery(document).ready(function(){

        jQuery.get({
            url: "https://nonsoloalimentatori.it/tools/download-center/index.php?sku="+sku,
            dataType: "jsonp",
            cache: true,
            success: function(){
                console.log("success");
            },
            error: function(){
                console.log("error");
            }
        }).done(function(){
            console.log("here");
        })


    })

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Credentials:');
header('Content-Type: application/json');

function searchJson($sku){
    $array = [];
    $json = file_get_contents('./list.json'); //read the file contente
    $json_data = json_decode($json,true); //creating the json objectt
    $n_elementi = count($json_data); //count the number of object element
for ($mul = 0; $mul < $n_elementi; ++$mul){ //for every element it is 
searched the sku
        if($json_data[$mul]["sku"] == $sku)//and it is compared to the sku 
        given by user
        {
            array_push($array,$json_data[$mul]);//if it is true the element 
        is added to array
        }
}
return $array; //it is returned
}

if(isset($_GET['sku'])){
$result=searchJson($_GET['sku']);

echo json_encode($result, JSON_PRETTY_PRINT);

}