一、数据持久化：一般是指页面刷新后，数据仍然能够保持原来的状态。

一般在前端当中，数据持久化，可以通过将数据存储到localstorage或Cookie中存起来，用到的时

候直接从本地存储中获取数据。而redux-persist是把redux中的数据在localstorage中存起来，起到

持久化的效果。

二、使用：

安装：npm i  redux-persist --save

在store.js中使用

//引入createStore，专门用于创建redux中最为核心的store对象
import { createStore } from 'redux'
import {persistStore, persistReducer} from 'redux-persist'
import storage from 'redux-persist/lib/storage'
//引入汇总之后的reducer
import reducers from './reducers'

import loading from '../redux/reducers/loading'

//在localStorge中生成key为root的值
const persistConfig = {
  key: 'root',
  storage,
  blacklist:['loading']  //设置某个reducer数据不持久化，
                         //注意单词的拼写！我就因为写错单词，找了半天,55555~
}

const myPersistReducer = persistReducer(persistConfig, reducers)

const store = createStore(myPersistReducer)

const persistor = persistStore(store)

export {
  store,
  persistor
}

在主入口文件，index.js中

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import { HashRouter } from 'react-router-dom'
import { store,persistor} from './redux/store'
import { Provider } from 'react-redux';
import './App.css';
import './utils/request'
import {PersistGate} from 'redux-persist/integration/react'

ReactDOM.render(
  /* 此处需要用Provider包裹App，目的是让App所有的后代容器组件都能接收到store */
  <Provider store={store}>
    <PersistGate loading={null} persistor={persistor}>
      <HashRouter>
        <App />
      </HashRouter>
    </PersistGate>
</Provider>,
  document.getElementById('root')
);

注意项目中store的引入方式为import {store} from'xxx'

三、最终效果