加入购物车修改

@@ -118,7 +118,7 @@ class Cart extends Model
             $stock_num = 9999999;
         }else{
         // 非定制
-            $spec_sku_id = 0;
+            $spec_sku_id = '';
             if($goods['spec_type'] == '2'){
                 if(empty($data['spec_sku_id'])){
                     $this->setError(__('请选择规格'));