在react+redux中预加载组件数据的正确方法

// actions.js
export const fetchData = () => {
  return async (dispatch) => {
    try {
      // 发起异步请求获取数据
      const response = await fetch('https://api.example.com/data');
      const data = await response.json();

      // 将数据存储在Redux的store中
      dispatch({ type: 'FETCH_DATA_SUCCESS', payload: data });
    } catch (error) {
      dispatch({ type: 'FETCH_DATA_FAILURE', payload: error.message });
    }
  };
};

// reducers.js
const initialState = {
  loading: false,
  error: null,
  data: null,
};

const dataReducer = (state = initialState, action) => {
  switch (action.type) {
    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;
  }
};

export default dataReducer;

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

class MyComponent extends Component {
  componentDidMount() {
    // 触发数据加载操作
    this.props.fetchData();
  }

  render() {
    // 根据加载状态显示不同的内容
    if (this.props.loading) {
      return <div>Loading...</div>;
    }

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

    return (
      <div>
        {/* 显示数据 */}
        {this.props.data && <div>{this.props.data}</div>}
      </div>
    );
  }
}

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

const mapDispatchToProps = {
  fetchData,
};

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