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react如何结合redux

2026-02-26 08:09:33React

React 结合 Redux 的步骤

安装必要的依赖包，确保项目中有 react-redux 和 redux。通过以下命令安装：

npm install react-redux redux

创建 Redux Store

在 src 目录下创建 store.js 文件，用于初始化 Redux store：

import { createStore } from 'redux';
import rootReducer from './reducers';

const store = createStore(rootReducer);

export default store;

定义 Reducer

创建 reducers 文件夹，定义根 reducer。例如 index.js：

import { combineReducers } from 'redux';
import counterReducer from './counterReducer';

const rootReducer = combineReducers({
  counter: counterReducer,
});

export default rootReducer;

示例子 reducer（counterReducer.js）：

const initialState = {
  count: 0,
};

const counterReducer = (state = initialState, action) => {
  switch (action.type) {
    case 'INCREMENT':
      return { ...state, count: state.count + 1 };
    case 'DECREMENT':
      return { ...state, count: state.count - 1 };
    default:
      return state;
  }
};

export default counterReducer;

连接 React 组件

使用 Provider 包裹根组件，将 store 传递给整个应用。修改 src/index.js：

import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import App from './App';
import store from './store';

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

在组件中使用 Redux

通过 useSelector 和 useDispatch Hook 访问状态和触发 action。例如 Counter.js：

import React from 'react';
import { useSelector, useDispatch } from 'react-redux';

const Counter = () => {
  const count = useSelector((state) => state.counter.count);
  const dispatch = useDispatch();

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => dispatch({ type: 'INCREMENT' })}>Increment</button>
      <button onClick={() => dispatch({ type: 'DECREMENT' })}>Decrement</button>
    </div>
  );
};

export default Counter;

异步 Action 处理（可选）

如需处理异步逻辑（如 API 调用），可使用 redux-thunk 中间件。安装后配置 store：

npm install redux-thunk

修改 store.js：

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

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

export default store;

定义异步 action：

const fetchData = () => {
  return async (dispatch) => {
    dispatch({ type: 'FETCH_START' });
    try {
      const response = await fetch('https://api.example.com/data');
      const data = await response.json();
      dispatch({ type: 'FETCH_SUCCESS', payload: data });
    } catch (error) {
      dispatch({ type: 'FETCH_ERROR', error });
    }
  };
};

react如何结合redux