//实现的Wxpay钩子方法
    public function Wxpay($param){
      require \'./Addons/Wxpay/WxPayPubHelper/WxPayPubHelper.php\';
      $jsApi = new \\JsApi_pub(); 
       
      //=========步骤1：网页授权获取用户openid============
      if (!isset($_GET[\'code\']))
      {
        //触发微信返回code码
        $url = $jsApi->createOauthUrlForCode(\\WxPayConf_pub::JS_API_CALL_URL.\'/order_id/\'.$param[\'order_id\']);
        Header(\"Location: $url\");
      }else
      {
        $order_id = $param[\'order_id\'];
        $info = M(\'Order\')->where(\'id=\'.$order_id)->find();
        if(empty($info) || $info[\'is_pay\'] == 1){
          dump(\'该订单不存在或已支付\'.$order_id);
          exit();
        }
        $this->assign(\'info\', $info);
        $a = $info[\'money\'];
        $b = 100;
        $c = $a * $b;
         
        //获取code码，以获取openid
        $code = $_GET[\'code\'];
        $jsApi->setCode($code);
        $openid = $jsApi->getOpenId();
      }
       
      //=========步骤2：使用统一支付接口，获取prepay_id============
      //使用统一支付接口
      $unifiedOrder = new \\UnifiedOrder_pub();
       
      $unifiedOrder->setParameter(\"openid\",\"$openid\");//商品描述
      $unifiedOrder->setParameter(\"body\",\"在线预订\");//商品描述
      //自定义订单号，此处仅作举例
      $timeStamp = time();
//       $out_trade_no = \\WxPayConf_pub::APPID.\"$timeStamp\";
      $out_trade_no = $info[\'ordersn\'];
      $unifiedOrder->setParameter(\"out_trade_no\", \"$out_trade_no\");//商户订单号
      $unifiedOrder->setParameter(\"total_fee\", \"$c\");//总金额
      $unifiedOrder->setParameter(\"notify_url\",\\WxPayConf_pub::NOTIFY_URL.\'/order_id/\'.$param[\'order_id\']);//通知地址
      $unifiedOrder->setParameter(\"trade_type\",\"JSAPI\");//交易类型
       
      $prepay_id = $unifiedOrder->getPrepayId();
      //=========步骤3：使用jsapi调起支付============
      $jsApi->setPrepayId($prepay_id);
      $jsApiParameters = $jsApi->getParameters();
      $this->assign(\'jsApiParameters\', $jsApiParameters);
 
      $this->display(\'pay\');
    }