物流点击默认清空问题优化

src/views/hisStore/components/productOrder.vue

@@ -689,6 +689,7 @@ export default {
       });
     },
     showExpress(){
+      this.traces=null;
       this.expressDialog.open=true;
       getExpress(this.orderId).then(response => {
           this.express = response.data;