chose-panel-goods-nums

@@ -112,7 +112,8 @@ class ChosePanel {
         return '加入购物车';
     }
     _defaultBuyNum() {
-        return this.modes.discount && this.data.discountBuy.num || 1;
+        return (this.modes.discount && this.data.discountBuy.num) ||
+            (this.data.cartInfo && this.data.cartInfo.num) || 1;
     }
 
     /**