es6的?.无法使用

app/service/users/personal.js

@@ -96,7 +96,7 @@ class PersonalService extends CrudService {
     const sheet = workbook.getWorksheet(1);
     let meta = this.importMeta();
     // 根据excel,将列序号加入meta中
-    const head = sheet.getRow(1)?.values;
+    const head = _.get(sheet.getRow(1), 'values', []);
     for (let i = 0; i < head.length; i++) {
       const e = head[i];
       if (!e) continue;