/**
* @brief 支付费用
*/
public function gePay_fee()
{
$payment_id = IFilter::act(IReq::get('pid'), 'int');
$total = IFilter::act(IReq::get('total'));
//获得order_class的对象
$ord_class = new Order_Class();
$pay_fee = $ord_class->get_payment($payment_id, $total);
//返回支付费用
echo $pay_fee;
}