我遇到了同样的问题，我使用了Object.Values（）方法。它返回一个不带键的值数组。您可以查看MDN文档以了解更多信息。但这是我的代码片段.这个应该能用顺便说一句，我用的是jsx。

import {
  useRouter
} from 'next/router';
import {
  useState
} from 'react';

const fetchData = async(url) => {
  const res = await fetch(url);
  const jsonData = await res.json();
  return jsonData;
};

const country = () => {
  const [data, setData] = useState(null);
  const router = useRouter();
  const {
    id
  } = router.query;
  fetchData(`https://restcountries.com/v3.1/name/${id}`).then((data) =>
    setData(data)
  );

  //here's the important part
  {
    data &&
      data.map(
        ({

            languages,
          },
          i
        ) => {
          const lang = Object.values(languages);
          return ( <
              p >
              <
              span className = "font-semibold" >
              Languages: {
                ' '
              } <
              /span> {
              lang.map((el, i) => ( <
                span key = {i}> {
                  ` ${el},`
                } < /span>
              ))
            } </p>
        )
      })
}