update

src/main/java/com/gogirl/application/product/mall/impl/MallShoppingCartCmdServiceImpl.java

@@ -71,7 +71,7 @@ public class MallShoppingCartCmdServiceImpl implements MallShoppingCartCmdServic
                         .eq(MallShoppingCart::getProductId, cmd.getProductId()));
 
         if (mallShoppingCart != null) {
-            mallShoppingCart.setNum((mallShoppingCart.getNum() - 1));
+            mallShoppingCart.setNum((mallShoppingCart.getNum() - cmd.getNum()));
             if (mallShoppingCart.getNum() > 0) {
                 mallShoppingCartMapper.updateById(mallShoppingCart);
             }