1.提交缺失的东西

app/api/logic/CartLogic.php

@@ -30,7 +30,7 @@ class CartLogic
     //添加购物车
     public static function add($item_id, $goods_num, $user_id)
     {
-        $goods = Db::name('goods g')
+        $goods = Db::name('goods')->alias('g')
             ->field('i.goods_id')
             ->join('goods_item i', 'i.goods_id = g.id')
             ->where('i.id', $item_id)