修复商品优惠金额

app/Services/OrderService.php

@@ -817,9 +817,12 @@ class OrderService
         foreach ($amounts as &$amount) {
             $i--;
 
+            $originalAmount = $amount;
+
             if ($i > 0) {
                 $amount = (int) bcdiv(bcmul($couponAmount, $amount, 0), $totalAmount, 2);
                 $couponAmount -= $amount;
+                $totalAmount -= $originalAmount;
             } else {
                 $amount = $couponAmount;
             }