取消异步/等待并更新组件状态

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

const MyComponent = () => {
  const [data, setData] = useState(null);
  const [loading, setLoading] = useState(false);
  const [cancelToken, setCancelToken] = useState(null);

  useEffect(() => {
    const fetchData = async () => {
      setLoading(true);
      try {
        const response = await axios.get('https://api.example.com/data', {
          cancelToken: cancelToken.token,
        });
        setData(response.data);
        setLoading(false);
      } catch (error) {
        if (axios.isCancel(error)) {
          console.log('Request canceled', error.message);
        } else {
          console.log('Error', error.message);
        }
        setLoading(false);
      }
    };

    fetchData();

    return () => {
      if (cancelToken) {
        cancelToken.cancel('Request canceled by user');
      }
    };
  }, [cancelToken]);

  const handleCancel = () => {
    if (cancelToken) {
      cancelToken.cancel('Request canceled by user');
    }
  };

  return (
    <div>
      {loading ? (
        <p>Loading...</p>
      ) : (
        <div>
          {data ? (
            <p>Data: {data}</p>
          ) : (
            <p>No data available</p>
          )}
          <button onClick={handleCancel}>Cancel</button>
        </div>
      )}
    </div>
  );
};

export default MyComponent;