Redux thunk异步操作无法访问第一个参数

import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';

// 定义action types
const FETCH_DATA = 'FETCH_DATA';
const FETCH_DATA_SUCCESS = 'FETCH_DATA_SUCCESS';

// 定义action creators
const fetchData = (url) => {
  return (dispatch, getState) => {
    // 访问第一个参数
    console.log(url);

    // 发起异步请求
    dispatch({ type: FETCH_DATA });

    // 模拟异步操作
    setTimeout(() => {
      // 异步操作完成后再次dispatch一个action
      dispatch({ type: FETCH_DATA_SUCCESS, payload: 'data' });
    }, 1000);
  };
};

// 定义reducer
const reducer = (state = {}, action) => {
  switch (action.type) {
    case FETCH_DATA:
      return { ...state, loading: true };
    case FETCH_DATA_SUCCESS:
      return { ...state, loading: false, data: action.payload };
    default:
      return state;
  }
};

// 创建store
const store = createStore(reducer, applyMiddleware(thunk));

// 调用action creators
store.dispatch(fetchData('https://api.example.com/data'));

// 获取state
console.log(store.getState());