JQ AJAX POST表单，包括上传文件

var formData = new FormData($('form')[0]);
    $.ajax({
        url:"{$INI[system][wwwprefix]}/manage/product/ajax.php?action=product_add_edit${$_GET['id']?'&id='.$_GET['id']:''}",
        type:"POST",
        dataType: "json",
        data:formData,
        success: X.json,
        cache: false,
        contentType: false,
        processData: false
    });