前端資料需要存在本地，來避免多次請求，提高前端效率。可以選的有cookie，localstorage，localsession各中區別，主要的就是大小限制等
比如登入資訊，管理系統的許可權，選單列表等，還是選擇存localstorage/localsession吧。在每次請求到資料後都去呼叫一次localstorage.set()感覺也挺麻煩的，最好的就是redux裡有了資料就直接自動放入localstorage裡，於是用redux-persist

npm install redux-persist --save

.babelrc 配置按需載入

 "plugins": [
 

    "transform-runtime", 
    ["import", { "libraryName": "redux-persist", "libraryDirectory": "es"}, "redux-persist"]
  ],

包裝createReducer或者rootReducer

import { createStore, applyMiddleware } from 'redux';
import createSagaMiddleware, { END } from 'redux-saga';
// 返回的是combineReducers
import createReducer from
 
 '../reducers/index';
import  { persistReducer } from 'redux-persist';
import storage from 'redux-persist/es/storage'

const sagamiddleware = createSagaMiddleware();
// 資料物件
const storageConfig = {
    key: 'root', // 必須有的
    storage, // storage is now required
    blacklist: [] // reducer 裡不持久化的資料
}

export default
 
 function configureStore(initStore = {}) {
    const middlewares = [sagamiddleware];
    const createStoreMiddleware = applyMiddleware(...middlewares)(createStore);
    const store = createStoreMiddleware(
        // 包裝createReducer 即 rootReducer
        persistReducer(storageConfig, createReducer()), initStore
    );

    store.runSaga = sagamiddleware.run;
    store.close = () => store.dispatch(END);
    // 熱過載
    if (module.hot) {
        module.hot.accept(() => {
            const nextRootReducer = require('../reducers/index').default;
            store.replaceReducer(persistReducer(storageConfig, createReducer(nextRootReducer)))
        }, )
    } 
    return store
}

再到app.js 入口檔案中，利用PersistGate包裹根組建

import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import rootSaga from './sagas/index';
import { persistStore } from 'redux-persist';
import { PersistGate } from 'redux-persist/es/integration/react';
import configureStore from "./store/configureStore";
import RootRoute from './router/rootRoute'; // 所有定義好的路由

const store = configureStore();
const persistor = persistStore(store);
store.runSaga(rootSaga);

const Loading = () => <div>loading</div>;

ReactDOM.render(
    <Provider store = {store} >
        <PersistGate loading={<Loading/>} persistor={persistor}>
            <RootRoute/>
        </PersistGate>
    </Provider>, 
    document.getElementById('root')
); 

登入後返回資訊儲存到localstorage裡