REACT 中的 404 页面

Question

我创建了组件NotFound，当我转到一个不存在的页面时它工作正常。但它出现在我所有页面中的同一页面，不仅仅是不存在的页面。这是组件：

import React from 'react'

const NotFound = () =>
  <div>
    <h3>404 page not found</h3>
    <p>We are sorry but the page you are looking for does not exist.</p>
  </div>

export default NotFound

这就是我在主页中使用它的方式：

class MainSite extends Component {
  render () {
    return (
      <div>
        {/* Render nav */}
        <Route path='/dashboard' component={Nav} />
        <Route path='/retrospectives' component={Nav} />
        <Route path='/users' component={Nav} />
        <Route path='/projects' component={Nav} />

        {/* Dashboard page */}
        <ProtectedRoute exact path='/dashboard' component={DashboardPage} />

        {/* Retrospectives page */}
        <ProtectedRoute exact path='/retrospectives' component={RetrospectivesPage} />

        {/* Users page */}
        <ProtectedRoute exact path='/users' component={UsersPage} />

        {/* Projects page */}
        <ProtectedRoute exact path='/projects' component={ProjectsPage} />

        {/* Retrospective related pages */}
        <Route exact path='/retrospectives/:retrospectiveId' component={Retrospective} />
        <Route exact path='/join-retrospective' component={JoinRetrospective} />
        <ProtectedRoute exact path='/create-retrospective/:retrospectiveId' component={Retrospective} />

        {/* OnBoarding pages */}
        <ProtectedRoute exact path='/beta-code' component={BetaCodeAccess} />
        <Route exact path='/auth-handler' component={AuthHandler} />
        <Route exact path='/join-organization' component={JoinOrganization} />
      </div>
    )
  }
}

export default MainSite

如您所见，我使用<Route path="*" component={NotFound} /> 创建 404 页面，但该组件也出现在每个现有页面中。我该如何解决这个问题？

Answer 1

试试这个：

  import { Switch, Route } from 'react-router-dom';

  <Switch>
    <Route path='/dashboard' component={Nav} />
    <Route path='/retrospectives' component={Nav} />
    <Route path='/users' component={Nav} />
    <Route path='/projects' component={Nav} />

    <Route path="" component={NotFound} />
  </Switch>

Answer 2

以下所有示例都可以正常工作：

<Route path="" component={NotFound} /> // empty ""
<Route path="*" component={NotFound} /> // star *
<Route component={NotFound} /> // without path

或者如果你想返回一个不带任何组件的简单 404 消息：

<Route component={() => (<div>404 Not found </div>)} />

Answer 3

试试这个：

import React from "react";
import { Redirect, Route, Switch, BrowserRouter } from 'react-router-dom';
import HomePage from './pages/HomePage.jsx';
import NotFoundPage from './NotFoundPage.jsx';
class App extends React.Component {
    render(){
        return(
            <BrowserRouter>
                <Switch>
                    <Route exact path='/' component={HomePage} />
                    <Route path="*" component={NotFoundPage} />
                </Switch>
            </BrowserRouter>
        )
    }
}
   
export default App;

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

Answer 4

只需从 react-router-dom 导入 Switch 并将所有路由包装在 Switch 组件中。同样重要的是要注意将 404Page 组件保持在最底部（就在您的 switch 结束标记之前），这样它将首先将每个组件与其路由匹配。如果匹配，它将渲染组件，否则检查下一个。最终如果没有匹配的路由建立，就会渲染404Page

Answer 5

对于那些使用react-router-dom v6 寻找答案的人来说，很多事情都发生了变化。例如，Switch 已不存在，您必须使用 element 而不是 component，...查看这个小示例以获得一个想法：

import React from 'react'
import ReactDOM from 'react-dom'
import { BrowserRouter as Router, Routes, Route } from 'react-router-dom'

import './index.css'
import App from './App'

const Test = () => (
  <h1>404</h1>
)

ReactDOM.render(
  <React.StrictMode>
    <Router>
      <Routes>
        <Route path='/' element={<App />} />
        <Route path='*' element={<Test />}/>
      </Routes>
    </Router>
  </React.StrictMode>,
  document.getElementById('root')
)

这样您就可以定义您的home 路线，所有订单路线都将显示 404。查看official guide 了解更多信息。