在三元表达式中返回Promise的函数不工作React

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

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

  useEffect(() => {
    async function fetchData() {
      try {
        const response = await fetch('API_URL');
        const jsonData = await response.json();
        setData(jsonData);
      } catch (error) {
        console.error(error);
      } finally {
        setLoading(false);
      }
    }

    fetchData();
  }, []);

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

  return (
    <div>
      {data ? <div>Data: {data}</div> : <div>No data available</div>}
    </div>
  );
}

export default ExampleComponent;