如何在react中使用redux从api获取数据

npm install redux react-redux

import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import rootReducer from './reducers';

const store = createStore(rootReducer, applyMiddleware(thunk));

export default store;

import { combineReducers } from 'redux';

const initialState = {
  data: [],
  loading: false,
  error: null,
};

const dataReducer = (state = initialState, action) => {
  switch (action.type) {
    case 'FETCH_DATA_REQUEST':
      return {
        ...state,
        loading: true,
        error: null,
      };
    case 'FETCH_DATA_SUCCESS':
      return {
        ...state,
        loading: false,
        data: action.payload,
      };
    case 'FETCH_DATA_FAILURE':
      return {
        ...state,
        loading: false,
        error: action.payload,
      };
    default:
      return state;
  }
};

const rootReducer = combineReducers({
  data: dataReducer,
});

export default rootReducer;

const fetchDataRequest = () => ({
  type: 'FETCH_DATA_REQUEST',
});

const fetchDataSuccess = (data) => ({
  type: 'FETCH_DATA_SUCCESS',
  payload: data,
});

const fetchDataFailure = (error) => ({
  type: 'FETCH_DATA_FAILURE',
  payload: error,
});

export const fetchData = () => {
  return (dispatch) => {
    dispatch(fetchDataRequest());
    fetch('https://api.example.com/data')
      .then((response) => response.json())
      .then((data) => dispatch(fetchDataSuccess(data)))
      .catch((error) => dispatch(fetchDataFailure(error)));
  };
};

import React, { useEffect } from 'react';
import { connect } from 'react-redux';
import { fetchData } from './actions';

const MyComponent = ({ data, loading, error, fetchData }) => {
  useEffect(() => {
    fetchData();
  }, []);

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

  if (error) {
    return <div>Error: {error.message}</div>;
  }

  return (
    <div>
      {data.map((item) => (
        <div key={item.id}>{item.name}</div>
      ))}
    </div>
  );
};

const mapStateToProps = (state) => ({
  data: state.data.data,
  loading: state.data.loading,
  error: state.data.error,
});

const mapDispatchToProps = {
  fetchData,
};

export default connect(mapStateToProps, mapDispatchToProps)(MyComponent);