update

app/service/business/payOrder.js

@@ -76,7 +76,7 @@ class PayOrderService extends CrudService {
       }
     } else {
       // 余额不够,在config里记录部分使用了余额,再进行下单,下单完后,生成余额的扣款
-      const needPay = surplus - money;
+      const needPay = money - surplus;
       const bill = _.pick(data, [ 'school_id', 'payer_id', 'payer_role', 'pay_for', 'from_id' ]);
       bill.money = surplus;
       bill.type = '-2';