react redux及redux持久化示例详解
作者:你华还是你华
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一、react-redux
react-redux依赖于redux工作。 运行安装命令:npm i react-redux
:
使用: 将Provider套在入口组件处,并且将自己的store传进去:
import FilmRouter from './FilmRouter/index' import {Provider} from 'react-redux' import store from './FilmRouter/views/redux/store'; ReactDOM.render( <Provider store={store}> <FilmRouter /> </Provider> , document.getElementById('root') );
然后在子组件导出的时候套一层connet组件,并且把父组件需要传入的值传入:
import React, { Component } from 'react' import FRouter from './Router/ReactRouter' import Tabbar from './components/Tabbar' import { connect } from 'react-redux' // import store from './views/redux/store' // let unSubscribe class Index extends Component { state = { // list: store.getState().TabbarReducer.list } // store.subscribe 订阅 componentDidMount() { console.log(this.props) // store.subscribe(() => { // console.log('订阅', store.getState()) // this.setState({ // isShow: store.getState().TabbarReducer.flag // }) // }) // unSubscribe = store.subscribe(() => { // this.setState({ // list: store.getState().TabbarReducer.list // }) // }) } // componentWillUnmount() { // unSubscribe() // } render() { return ( <div> <FRouter> {this.props.isShow && <Tabbar></Tabbar>} </FRouter> </div> ) } } const mapStateToProps = (state) => { return { a: 1, b: 2, isShow: state.TabbarReducer.flag } } export default connect(mapStateToProps)(Index)
可以看到我们包了一层connect后把我们的reducer给传入进去,那在子组件中就可以直接使用this.props来获取这个值来决定是否渲染了:
可以看到效果还是跟之前一样,只不过采用了react-redux,那么我们在Detaile组件中就不用自己去分发dispatch事件了,将Details
组件修改为:
import React, {useEffect} from 'react' import { hide, show } from './redux/actionCreator/TabbarActionCreator' // import store from './redux/store' import {connect} from 'react-redux' function Detaill(props) { console.log(props.match.params.filmId) // 第一种方式路由获取参数 // console.log(props.location.query.filmId) // 第二种方式路由获取参数 // console.log(props.location.state.filmId) // 第三种方式路由获取参数 let {show, hide} = props useEffect(() => { console.log('创建') // store.dispatch(hide()) hide() return () => { console.log('销毁') // store.dispatch(show()) show() } },[show,hide]) return ( <div>Detaill</div> ) } const mapDispatchToProps = { show, hide } // connect接收两个参数,第一个是属性,第二个是回调函数 export default connect(null, mapDispatchToProps)(Detaill);
可以看到这里都不需要我们去dispatch分发了,直接使用connect传入到之前TabbarReducer写好的类型以在子组件中以函数的形式去调用:
二、redux持久化
npm i redux-persist
修改store.js
代码:
import { applyMiddleware, combineReducers, createStore, compose } from "redux"; import TabbarReducer from "./reducers/TabbarReducer"; import reduxThunk from "redux-thunk" import reduxPromise from "redux-promise" import { persistStore, persistReducer } from 'redux-persist' import storage from 'redux-persist/lib/storage' // defaults to localStorage for web const persistConfig = { key: 'TabbarReducer', storage, // blacklist: ['TabbarReducer'] // navigation will not be persisted 黑名单 whitelist: ['TabbarReducer'] // only navigation will be persisted 白名单 } const reducer = combineReducers({ TabbarReducer }) const persistedReducer = persistReducer(persistConfig, reducer) const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose; const store = createStore(persistedReducer, /* preloadedState, */ composeEnhancers( applyMiddleware(reduxThunk, reduxPromise) )); let persistor = persistStore(store) export {store, persistor};
然后在根组件中修改:
import FilmRouter from './FilmRouter/index' import {Provider} from 'react-redux' import {store, persistor} from './FilmRouter/views/redux/store'; import { PersistGate } from 'redux-persist/integration/react'; ReactDOM.render( <Provider store={store}> <PersistGate loading={null} persistor={persistor}> <FilmRouter /> </PersistGate> </Provider> , document.getElementById('root') );
效果:
以上就是react redux及redux持久化示例详解的详细内容,更多关于react redux持久化的资料请关注脚本之家其它相关文章!