小编Tom*_*mmm的帖子

我收到错误消息“无法读取未定义的属性'map'”，但无法弄清原因-地图未起作用，因为“电影”未定义。你能看到我做错了吗？非常感谢。

const Dashboard = () => {
  const discoverUrl = 'https://movied.herokuapp.com/discover';
  const [movieList, setMovies] = useState({ movies: [] });

  useEffect(() => {
    const getAllMovies = () => {
      fetch(discoverUrl)
        .then(response => response.json())
         .then(data => setMovies(data))
        }
        getAllMovies()

      }, [])

  return (
    <ul>
      {movieList.movies.map(movie => (
        <li>
          <p>{movie}</p>
        </li>
      ))}
    </ul>
  );
}

export default Dashboard```

TypeError: Cannot read property 'map' of undefined