AJAX请求JSON失败

Question

I have a problem with an ajax request, when I do the request with the property dataType: 'json', my response come with an error, parsererror, my function in PHP returns the data like json_encode(), pls, can you help me? when I do the request without property dataType: 'json' my data is ALL THE DOCUMENT HTML.

My request:

                var dataAr = {Latitude: Latitude, Longitude: Longitude};/
                console.log(dataAr);
                $.ajax({
                    data: dataAr,
                    dataType: 'json',
                    type: 'POST',
                    url: 'http://localhost/GPS/Server.php/GPS/Coords',
                    success: function (data, response) {
                        console.log('Data: '+data);
                        console.log('Response: '+response);

                    },
                    error: function  (textStatus, errorThrown) {
                        console.log('Status: '+textStatus);
                        console.log('Error: '+errorThrown);                            
                    }
                });

My function in PHP:

class GPS 
{
    function Coords()
    {
        $Res=$_POST['data'];
        $Latitude=$_POST['Latitude'];
        $Longitude=$_POST['Longitude'];

        return json_encode($Res);            
    }
}

Answer 1

Try using content-type :

function Coords()
{
    $Res=$_POST['data'];
    $Latitude=$_POST['Latitude'];
    $Longitude=$_POST['Longitude'];

    header('Content-Type: application/json'); // <-- HERE
    return json_encode($Res);            
}