添加对修改购物车商品数据以及数目接口对传递商品sku以及sku的验证

Code Review By Rock Zhang

@@ -311,11 +311,17 @@ class CartModel
     {
         $result = array('code' => 400, 'message' => '出错啦~');
 
+        do {
+            if (empty($sku)) {
+                braek;
+            }
+
             $modify = CartData::modifyProductNum($uid, $sku, $increaseNum, $decreaseNum, $shoppingKey);
             if ($modify && isset($modify['code'])) {
                 $result['code'] = $modify['code'];
                 $result['message'] = $modify['message'];
             }
+        }while(0);
 
         return $result;
     }
@@ -332,6 +338,11 @@ class CartModel
     {
         $result = array('code' => 400, 'message' => '出错啦~');
 
+        do {
+            if (empty($param['old_product_sku']) || empty($param['new_product_sku'])) {
+                break;
+            }
+
             // 处理要更改的数据
             $swapData = json_encode(array($param));
 
@@ -340,6 +351,7 @@ class CartModel
                 $result['code'] = $modify['code'];
                 $result['message'] = $modify['message'];
             }
+        }while(0);
 
         return $result;
     }