react路由守卫的实现(路由拦截)

...
router.beforeEach(async(to, from, next) => {
    const toPath = to.path;
    const fromPath = from.path;
})
...

import * as React from 'react';
import { HashRouter,Switch,Route,Redirect } from 'react-router-dom';
 
import Index from "./page/index";
import Home from "./page/home";
import ErrorPage from "./page/error";
import Login from "./page/login";
 
export const Router = () => (
    <HashRouter>
        <Switch>
            <Route path="/" exact component={Index}/>
            <Route path="/login" exact component={Login}/>
            <Route path="/home" exact component={Home}/>
            <Route path="/404" exact component={ErrorPage}/>
            <Redirect to="/404" />
        </Switch>
    </HashRouter>
);

/**
 * 定义路由组件，将 auth 设置为 true，表示该路由需要权限校验
 */

import Admin from "./pages/Admin";
import Login from "./pages/Login";
import Error from "./pages/Error";

export const routerMap = [
    {path: "/", name: "admin", component: Admin, auth: true},
    {path: "/login", name: "Login", component: Login},
    {path: "/error", name: "error", component: Error},
];

/**
 * 路由守卫校验
 */
import React, {Component} from "react";
import {Route, Redirect} from "react-router-dom";

class FrontendAuth extends Component {
    // eslint-disable-next-line no-useless-constructor
    constructor(props) {
        super(props);
    }

    render() {
        const {routerConfig, location} = this.props;
        const {pathname} = location;
        const isLogin = localStorage.getItem("user");
        console.log(pathname, isLogin);
        console.log(location);
        // 如果该路由不用进行权限校验，登录状态下登陆页除外
        // 因为登陆后，无法跳转到登陆页
        // 这部分代码，是为了在非登陆状态下，访问不需要权限校验的路由
        const targetRouterConfig = routerConfig.find(
            (item) => item.path === pathname
        );
        console.log(targetRouterConfig);
        if (targetRouterConfig && !targetRouterConfig.auth && !isLogin) {
            const {component} = targetRouterConfig;
            return <Route exact path={pathname} component={component}/>;
        }
        if (isLogin) {
            // 如果是登陆状态，想要跳转到登陆，重定向到主页
            if (pathname === "/login") {
                return <Redirect to="/"/>;
            } else {
                // 如果路由合法，就跳转到相应的路由
                if (targetRouterConfig) {
                    return (
                        <Route path={pathname} component={targetRouterConfig.component}/>
                    );
                } else {
                    // 如果路由不合法，重定向到 404 页面
                    return <Redirect to="/error"/>;
                }
            }
        } else {
            // 非登陆状态下，当路由合法时且需要权限校验时，跳转到登陆页面，要求登陆
            if (targetRouterConfig && targetRouterConfig.auth) {
                return <Redirect to="/login"/>;
            } else {
                // 非登陆状态下，路由不合法时，重定向至 404
                return <Redirect to="/error"/>;
            }
        }
    }
}

export default FrontendAuth;

import './App.less';
import React, {Fragment} from "react";
import {Switch} from 'react-router-dom'
import FrontendAuth from "./FrontendAuth";
import {routerMap} from "./routerMap";

function App() {
    return (
        <Fragment>
            {/*只匹配一个，匹配成功就不往下匹配，效率高*/}
            <Switch>
                <FrontendAuth routerConfig={routerMap}/>
            </Switch>
        </Fragment>
    );
}

export default App;