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app/admin/model/InvoiceOrder.php

@@ -18,7 +18,7 @@ class InvoiceOrder extends \think\Model{
     }
     public static function getInvoiceOrderTotalFee($code){
         $banance =  (new InvoiceOrder)->where(['code'=>$code,'status'=>[1,2]])->field('sum(ifnull(total_amount-balance_amount,0)) as total_amount')->find();
-        return $banance['total_amount']??0;
+        return $banance['total_amount']??"0";
     }
 
     public function getMergeCodeAttr($value,$data){