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var formData = new FormData($(this)[0]);
//formData.append("name", "valor");
$.ajax(
{
    type: "POST",
    //dataType: "json",
    url: "ajax/addSector.php",
    data: formData,
    contentType: false,
    processData: false,
    success: function(data)
    {
        console.log(data);
    }
});