更新

app-ghs/controllers/ProductController.php

@@ -44,7 +44,7 @@ class ProductController extends BaseController
         $oldOnStock = $info->onStock ?? 0;
         $newOnStock = $onStock;
         $num = bcsub($newOnStock, $oldOnStock);
-        echo $num.' |';
+        echo $num.' |'.$oldOnStock.' ] '.$newOnStock.'-';
         $num = abs($num);
         echo $num;die;