Reactjs React Redux钩子未找到状态

我正在关注这个

我的状态未定义，我连接了我的商店，或者我认为我连接了。我不知道是什么问题。减速器代码不相等。我只是想把任何东西都退回去，以得到一个美好的世界。我以前用过react redux

//index.js 
import React from 'react';
import ReactDOM from 'react-dom';
import App from './js/App';
import * as serviceWorker from './serviceWorker';
import { Provider } from 'react-redux';
import { createStore,} from 'redux';
import reducers from './js/reducers';

const store = createStore(reducers);

ReactDOM.render(
    <Provider store={store}>
      <React.StrictMode>
        <App />
      </React.StrictMode>
    </Provider>,
  document.getElementById('root')
);

---

您缺少一个的初始状态

import { EXAMPLES } from "../actions/types";

// declare it here. 

const initialState = {
 data:[]
};

export function OneReducer(state = initialState, action) {
  switch (action.type) {
    case EXAMPLES:
      return action.payload;
    default:
      return state;
  }
  return state;
}

你可以试试这个

const data = useSelector((state) => state.data) // refers to initial state data property

---

感谢我的工作，我发现有人发布了有效的代码，我将其与我的代码进行了比较，它是“（state）=>state.data”我只是使用“state”

//ExampleReducers.js
import {EXAMPLES} from "../actions/types";
export function OneReducer (state = {}, action) {
        switch (action.type) {
            case EXAMPLES:
                return  action.payload
            default:
                return state
        }
        return state;

}

import { EXAMPLES } from "../actions/types";

// declare it here. 

const initialState = {
 data:[]
};

export function OneReducer(state = initialState, action) {
  switch (action.type) {
    case EXAMPLES:
      return action.payload;
    default:
      return state;
  }
  return state;
}

const data = useSelector((state) => state.data) // refers to initial state data property