在react中映射json数据时出现问题

import React, { useState, useEffect } from 'react';

function DataList() {
  const [data, setData] = useState([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    // 假设fetchData是一个获取数据的异步函数
    async function fetchData() {
      try {
        const response = await fetch('https://api.example.com/data');
        const jsonData = await response.json();
        setData(jsonData);
      } catch (error) {
        console.error('Error fetching data:', error);
      } finally {
        setLoading(false);
      }
    }

    fetchData();
  }, []);

  if (loading) {
    return <div>Loading...</div>;
  }

  if (data.length === 0) {
    return <div>No data available.</div>;
  }

  return (
    <ul>
      {data.map((item, index) => (
        <li key={index}>{item.name}</li>
      ))}
    </ul>
  );
}

export default DataList;