未选择文件阻止提交

src/views/manager/projectinfo/tree.vue

@@ -1858,6 +1858,7 @@ export default {
           type: "warning",
           message: "请先选择文件再进行导入"
         });
+        return;
       }
       let forms = new FormData();
       forms.append('excelFile', this.upFile);