React学习时，outlet配置(token判定，页面path监听)

import { HashRouter, Routes, Route } from 'react-router-dom';
import Main from './main';
import Login from './page/login'
import Home from './page/home/home'
import About from './page/about/about'
import Integrated from './page/integrated/integrated'
import Sidebar from './page/sidebar/sidebar'
import Latent from './page/latent/latent'
import Particulars from './page/particulars/particulars'
import SecurityCheck from './page/securityCheck/securityCheck'
function App() {
  {/* 默认显示页面将不需要填写路径 ，子路由不需要写/斜杠跳转时会带有*/ }
  return (
    <HashRouter>
      <Routes>
        {/* Main 负责token的判定(刷新和前往) */}
        <Route path='/' element={<Main />} >
          <Route path='/login' element={<Login />} ></Route>
          <Route path='/about' element={<About />} >
            <Route path='' element={<Integrated />} ></Route>
            <Route path='sidebar' element={<Sidebar />} >
              <Route path='' element={<Latent />} ></Route>
              <Route path='particulars' element={<Particulars />} ></Route>
              <Route path='securityCheck' element={<SecurityCheck />} ></Route>
            </Route>
          </Route>
          <Route path='/home' element={<Home />} ></Route>
        </Route>  
      </Routes>
    </HashRouter>
  );
}

export default App;

import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

// main 组件, 充当 路由子组件的主体 
// 判定 page页发生改变
// 判定 token 的 状态变更
// 判定 不存在的页面 404~ 

import React, { Component, useEffect, useState } from 'react'
import { Outlet, useLocation, useNavigate } from 'react-router-dom';
import storage from './util/storage';

const Index = () => {
    const location = useLocation(); //获取生命周期钩子(页面变化)
    const [pathname, setpathname] = useState() //监听地址变化
    const navigate = useNavigate(); //获取生命周期钩子(page跳转)
    const Token = storage.get('token'); //获取本地缓存:token
    const [newToken, oldToken] = React.useState(Token)
    // console.log('Main页打印Token:', Token)
    // console.log('Main页打印location.pathname', location.pathname)

    // let Daa={
    //     pathname:'', //地址名
    //     token:'',//附加token
    // }
    // const [allData,setAllData] =React.useState(Daa) //上下文数据

    useEffect(() => { //监听location变化 
        if (!Token) { //不存在
            if (location.pathname === '/') { //地址栏不全
                navigate('/login')
            }
            else if (location.pathname != '/login') {//地址为登录后
                navigate('/login')
            }
        } else { //存在
            if (location.pathname === '/') { //地址栏不全
                navigate('/login')
            }
        }
        setpathname(location.pathname) //更新page页面名
    }, [location])
    return <Outlet context={[newToken, oldToken]}></Outlet>
}

export class Main extends Component {
    render() {
        return (
            <>
                <Index />
            </>
        )
    }
}
export default Main

var storage = {
    set(key, value) { // 添加/编辑  缓存
        localStorage.setItem(key, JSON.stringify(value))

    },
    get(key) { // 取出缓存数据
        return JSON.parse(localStorage.getItem(key))

    },

    remover(key) { // 移除指定缓存
        localStorage.removeItem(key)

    }
}

export default storage;

import React, { Component } from 'react'
import storage from '../../util/storage'
import { useNavigate, useOutletContext } from 'react-router-dom';

const Login = () => {
  const [newToken, oldToken] = useOutletContext();
  const navigate = useNavigate();
  let params = {
      message: '这是跳转时携带的参数',
  }
  const storageToken = () => {
    if (!newToken) {
      storage.set('token', '这是被存储的token')
      navigate('/about', { state: params });
    } else {
      storage.remover('token')
    }
    oldToken(() => { return storage.get('token')})
  }

  const Btn = () => {
    if (!newToken) {
      return <>
        <button onClick={storageToken}>点击缓存token</button>
      </>
    } else {
      return <>
        <button onClick={storageToken}>点击清除token</button>
      </>
    }
  }

  return <>
    <h4>这里是登录前</h4>
    <Btn />
    <br />
    <span>{newToken}</span>
  </>
}
export default Login

import React from 'react';
import { Outlet, useNavigate, useLocation } from 'react-router-dom';

export default function About() {
    const navigate = useNavigate();
    // 需要注意的是 useNavigate() 跳转只能在无状态组件中进行 
    let ddd = ['c', 'n']

    const [count, setCount] = React.useState(ddd); // 数据共享
    // 需要注意的是，它只能传入两组字段，一组为原始数据，一组变更数据，用作对比时，每次数据变动
    // 页面随之更新  传入的数据类型由自己决定

    const state = useLocation() //接收参数
    console.log('state', state)

    //  navigate('', {}) // 前往默认页
    //  navigate('/home', {}) // 前往其他页
    //  navigate('文件名/子文件', {}) //前往子级
    //  navigate('文件名', {replace: true}) //前往当前路由其他同级页  replace: true 重定向
    return (
        <>
            <h4>About</h4>
            <button onClick={() => {
                navigate('test', { state: ddd });
                // state 传参不限制传参类型
            }}>点击Test页</button>
            <Outlet context={[count, setCount]} />
        </>
    )
}