组件-在UseEffect中更新自定义挂钩

import { useState, useEffect } from 'react';

function useFetch(url) {
  const [data, setData] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    let isMounted = true;

    const fetchData = async () => {
      try {
        const response = await fetch(url);
        const result = await response.json();
        if (isMounted) {
          setData(result);
        }
      } catch (err) {
        if (isMounted) {
          setError(err);
        }
      } finally {
        if (isMounted) {
          setLoading(false);
        }
      }
    };

    fetchData();

    return () => {
      isMounted = false;
    };
  }, [url]);

  return { data, loading, error };
}

export default useFetch;