react中redux的详细使用以及持久化处理
一.redux使用
1.安装
npm i redux
例一：
2.创建redux文件夹，store.js文件
store.js文件
import {legacy_createStore as createStore,combineReducers}from "redux"
// 每一块状态内容对应一个reducer文件
import {CollApsedReducer} from "./CollapsedReducer"
import {LoadingReducer}from "./LoadingReducer"
// combineReducers合并多个reducer
const reducer=combineReducers({
CollApsedReducer,
LoadingReducer
})
// createStore里面只能放一个reducer,所以上面合并处理一下
const store=createStore(reducer)
export default store3.将提供者绑定到跟组件内外层，使每个被包裹的组件都可以使用store
import React from 'react';
import IndexRouter from "../src/router"
import {Provider}from "react-redux"
import store from "../src/redux/store"
function App() {
return (
);
}
export default App;
4.更改状态
import React , { useState }from 'react'
import { Layout,Button ,Avatar, Space,Dropdown } from 'antd';
import {
MenuFoldOutlined,
MenuUnfoldOutlined,
UserOutlined
} from '@ant-design/icons';
import { useHistory } from 'react-router-dom'
import {connect}from "react-redux"
const { Header } = Layout;
// 接收props并使用
function TopHeader(props) {
console.log(props);
// const [collapsed, setCollapsed] = useState(false);
const history = useHistory()
const isCollapsed=()=>{
props.changeCollapsed()
}
const items = [
{
key: '1',
primary: true,
label: '超级管理员',
},
{
key: '2',
danger: true,
label: '退出登录',
},
];
const onClick = ({ key }) => {
if(key==="2"){
localStorage.removeItem("token")
history.push({pathname: '/login'})
}
};
return (
:
e.preventDefault()}>
)
}
// 更新props
const mapStateToProps=({CollApsedReducer:{isCollapsed}})=>{
return{
isCollapsed
}
}
// 更新action
const mapDispatchToProps={
changeCollapsed(){
return {
type:"change_collapsed"
}
}
}
// connect()(组件名)
// connect函数将组件连接到store仓库
export default connect(mapStateToProps,mapDispatchToProps)(TopHeader)5.使用状态变化的组件
import React, { useState, useEffect } from 'react';
import { useHistory, withRouter } from 'react-router-dom';
import { Layout, Menu } from 'antd';
import { UserOutlined, DesktopOutlined, FileOutlined, PieChartOutlined, TeamOutlined } from '@ant-design/icons';
import "../newssandbox/index.css";
// 引入connect
import {connect}from "react-redux"
const { Sider } = Layout;
const { SubMenu } = Menu;
function SideMenu(props) {
// props接收
const [selectedKey, setSelectedKey] = useState(null);
const select=[props.location.pathname.split("/")[1]]
const history = useHistory();
const onClick = (e) => {
history.push(e.key);
};
useEffect(() => {
// 根据路由变化更新选中的菜单项
const currentPath = props.location.pathname;
setSelectedKey(currentPath);
}, [props.location.pathname]);
function renderMenuItems(items) {
return items.map((item) => {
if (item.children) {
return (
{renderMenuItems(item.children)}
);
} else {
return (
{item.label}
);
}
});
}
const items = [
{
key: '/home',
label: '首页',
icon:
全球新闻发布管理系统
);
}
// {CollApsedReducer:{isCollapsed}}CollApsedReducer reducer文件导出的变量名,isCollapsed状态，此处进行解构
const mapStateToProps=({CollApsedReducer:{isCollapsed}})=>{
return{
isCollapsed
}
}
export default connect(mapStateToProps)(withRouter(SideMenu));例二：
1.新建LoadingReducer.js文件
export const LoadingReducer=(prevState={
loading:false
},action)=>{
let {type,payload}=action
switch (type) {
case 'change_loading':
// 复制老状态,不可直接修改
let newState={...prevState}
newState.loading=payload
return newState
default:
return prevState
}
}2.路由文件
import React from 'react'
import {Route,Switch,Redirect}from "react-router-dom"
import Home from "../../views/newssandbox/home/Home"
import UserList from "../../views/newssandbox/user-mange/UserList"
import RoleList from"../../views/newssandbox/right-manage/RoleList"
import RightList from"../../views/newssandbox/right-manage/RightList"
import NoPermission from "../../views/newssandbox/nopermission/Nopermission"
import NewsAdd from "../../views/newssandbox/news-manage/NewsAdd"
import NewsDraft from "../../views/newssandbox/news-manage/NewsDraft"
import NewsCategory from "../../views/newssandbox/news-manage/NewsCategory"
import AuditManage from "../../views/newssandbox/audit-manage/AuditManage"
import AuditList from "../../views/newssandbox/audit-manage/AuditList"
import Unpublished from "../../views/newssandbox/publish-manage/Unpublished"
import Publishedd from "../../views/newssandbox/publish-manage/Publishedd"
import Sunset from "../../views/newssandbox/publish-manage/Sunset"
import { Spin } from 'antd';
import {connect}from "react-redux"
function NewsRouter(props) {
return (
{/* 为每个页面使用loading功能 */}
{/* 如果访问根路径回车精确匹配重定向到home页面 */}
)
}
const mapStateToProps=({LoadingReducer:{loading}})=>{
return{
loading
}
}
const mapDispatchToProps={
changeCollapsed(){
return {
type:"change_loading"
}
}
}
export default connect(mapStateToProps,mapDispatchToProps)(NewsRouter)3.在axios封装文件内使用
import axios from "axios";
import store from "../redux/store";
axios.defaults.baseURL = "http://localhost:3000";
axios.interceptors.request.use(
(config) => {
// 显示loading
store.dispatch({
type: "change_loading",
payload: true,
});
return config;
},
(error) => {
return Promise.reject(error);
}
);
axios.interceptors.response.use(
(response) => {
// 隐藏loading
store.dispatch({
type: "change_loading",
payload: false,
});
return response;
},
(error) => {
// 隐藏loading
store.dispatch({
type: "change_loading",
payload: false,
});
return Promise.reject(error);
}
);
export default axios;
二.持久化
1.安装
npm i redux-persist
2.store.js文件配置持久化
import {legacy_createStore as createStore,combineReducers}from "redux"
import {CollApsedReducer} from "./CollapsedReducer"
import {LoadingReducer}from "./LoadingReducer"
//配置数据的持久化效果
import { persistReducer, persistStore } from "redux-persist";
//导入需要配置的数据源，可以选择，storage，cookie,session等
import storage from "redux-persist/lib/storage";
const reducer=combineReducers({
CollApsedReducer,
LoadingReducer
})
//定义配置的信息
const persitConfig = {
// 代表存储名,随便起
key:"root",
storage,
// 如果不想将部分state持久化，也可以将其放入黑名单(blacklist)中,白名单whitelist
// 将loading 模块不做持久化
blacklist:["LoadingReducer"]
}
//创建持久化的配置persist的信息
const persistReducers = persistReducer(persitConfig,reducer);
//创建存储对象并且抛出对象
const store=createStore(persistReducers)
const persistor =persistStore(store);
export{store,persistor}3.仓库导出方式更改了，组件引入方式要改变
4.根组件内使用PersistGate
import React from 'react';
import IndexRouter from "../src/router"
import {Provider}from "react-redux"
import {store,persistor} from "../src/redux/store"
// 在入口文件中使用 PersistGate 包裹根组件。将延迟渲染app 视图直到持久化状态取回并保存到redux中
import {PersistGate}from "redux-persist/integration/react"
function App() {
return (
);
}
export default App;