添加this

src/views/system/order/components/orderDetail.vue

@@ -360,7 +360,7 @@ export default {
     handleInfo() {
       this.detailDialog = true
       // let order_sn = '20200318e095e2d09354'
-      let order_sn = orderDetail.parent_order_sn
+      let order_sn = this.orderDetail.parent_order_sn
 
       orderInfo({order_sn: order_sn}).then(res => {
         if (res.code == 1) {