jquery发送ajax请求

var data =  {op:'prize_del', turntable_id: 12, prize_id:3};
$.ajax({
    type: 'post',
    url: '/mc/basic/turntable_index.php',
    data: data,
    dataType: 'json',
    success: function (res) {
        if (res.code == 200) {
            _self.parents('tr.J-prize-rowspan').remove();
        } else {
            alert('error');
        }
    }
})

$op = $_REQUEST["op"];
if ($op == "prize_del") {
    $prize_id = $_REQUEST["prize_id"];
    if (!empty($prize_id)) {
        $data['code'] = 200;
        echo json_encode($data);
    } else {
        //没有选择删除项
        $data['code'] = 400;
        echo json_encode($data);
    }
    exit;
}