1、 项目根目录下新建routes路由文件夹和路由文件index.js，在index.js添加如下代码，用与存放路由、配置路由，分别添加了mainRoutes和adminRoutes模块
import Login from '../pages/Login/Login';
import Wecome from '../pages/Home/Wecome';
import PageNotFound from '../pages/PageNotFound/PageNotFound';
export const mainRoutes = [
{
path: '/login',
component: Login
},
{
path: '/404',
component: PageNotFound
}
]
export const adminRoutes = [{
path: '/admin/wecome',
component: Wecome
}]2、 项目更目录src\index.js相关代码：
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import reportWebVitals from './reportWebVitals';
import {HashRouter as Router, Switch, Route, Redirect} from 'react-router-dom';
import { mainRoutes } from './routes'
import App from './App';
ReactDOM.render(
<Router>
<Switch>
<Route path="/admin" render={routeProps=><App {...routeProps} />}/>
{mainRoutes.map(route=>{
return <Route key={route.path} {...route}/>;
})}
<Redirect to="/404"/>
</Switch>
</Router>,
document.getElementById('root')
);
// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
reportWebVitals();3、 修改项目根目录app.js下代码，引入adminRoutes代码，用来显示后台相关页面
import React from "react"
import { Switch, Route, Redirect } from 'react-router-dom';
import { adminRoutes } from './routes';
function App() {
return (
<div className="App">
<h1>app</h1>
<Switch>
{adminRoutes.map(route=>{
return <Route key={route.path} path={route.path} exact={route.exact} render={routeProps=>{
return <route.component {...routeProps}/>
}} />
})}
</Switch>
</div>
);
}
export default App;4、新建/pages/PageNotFound/，并创建文件PageNotFound.js，做404页面
import React from 'react'
function PageNotFound() {
return (
<div>
<h1>404</h1>
</div>
)
}
export default PageNotFound上面封装好路由也，如果页面url不存在，则会跳转到404页面。
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