问题

<BrowserRouter>
  <Switch>
    {authLogin ? (
      <>
        <Route path="/dashboard" component={Dashboard} exact />
        <Route exact path="/About" component={About} />
      </>
    ) : (
      <Route path="/" component={Login} exact />
    )}

    <Route component={PageNotFound} />
  </Switch>
</BrowserRouter>

除了 Switch 和 Route 不 Redirect 。如果您想像这样“嵌套”，则需要将每个都包装在通用路由中，但这是完全没有必要的。

您的登录组件也无法处理重定向回任何最初访问的“主页”或私人路线。

解决方案

react-router-dom v6

在版本 6 中，自定义路由组件已不再受欢迎，首选方法是使用 auth 布局组件。

import { Navigate, Outlet } from 'react-router-dom';

const PrivateRoutes = () => {
  const location = useLocation();
  const { authLogin } = useContext(globalC);

  if (authLogin === undefined) {
    return null; // or loading indicator/spinner/etc
  }

  return authLogin 
    ? <Outlet />
    : <Navigate to="/login" replace state={{ from: location }} />;
}

...

<BrowserRouter>
  <Routes>
    <Route path="/" element={<PrivateRoutes />} >
      <Route path="dashboard" element={<Dashboard />} />
      <Route path="about" element={<About />} />
    </Route>
    <Route path="/login" element={<Login />} />
    <Route path="*" element={<PageNotFound />} />
  </Routes>
</BrowserRouter>

或者

const routes = [
  {
    path: "/",
    element: <PrivateRoutes />,
    children: [
      {
        path: "dashboard",
        element: <Dashboard />,
      },
      {
        path: "about",
        element: <About />
      },
    ],
  },
  {
    path: "/login",
    element: <Login />,
  },
  {
    path: "*",
    element: <PageNotFound />
  },
];

...

export default function Login() {
  const location = useLocation();
  const navigate = useNavigate();
  const { authLogin, loginData } = useContext(globalC);

  useEffect(() => {
    if (authLogin) {
      const { from } = location.state || { from: { pathname: "/" } };
      navigate(from, { replace: true });
    }
  }, [authLogin, location, navigate]);

  return (
    <div
      style={{ height: "100vh" }}
      className="d-flex justify-content-center align-items-center"
    >
      <button type="button" onClick={loginData} className="btn btn-primary">
        Login
      </button>
    </div>
  );
}

react-router-dom v5

创建一个 PrivateRoute 使用您的身份验证上下文的组件。

const PrivateRoute = (props) => {
  const location = useLocation();
  const { authLogin } = useContext(globalC);

  if (authLogin === undefined) {
    return null; // or loading indicator/spinner/etc
  }

  return authLogin ? (
    <Route {...props} />
  ) : (
    <Redirect
      to={{
        pathname: "/login",
        state: { from: location }
      }}
    />
  );
};

更新您的 Login 组件以处理重定向回正在访问的原始路线。

export default function Login() {
  const location = useLocation();
  const history = useHistory();
  const { authLogin, loginData } = useContext(globalC);

  useEffect(() => {
    if (authLogin) {
      const { from } = location.state || { from: { pathname: "/" } };
      history.replace(from);
    }
  }, [authLogin, history, location]);

  return (
    <div
      style={{ height: "100vh" }}
      className="d-flex justify-content-center align-items-center"
    >
      <button type="button" onClick={loginData} className="btn btn-primary">
        Login
      </button>
    </div>
  );
}

在“平面列表”中呈现所有路线

function Routes() {
  return (
    <BrowserRouter>
      <Switch>
        <PrivateRoute path="/dashboard" component={Dashboard} />
        <PrivateRoute path="/About" component={About} />
        <Route path="/login" component={Login} />
        <Route component={PageNotFound} />
      </Switch>
    </BrowserRouter>
  );
}

先生您好。我试过您的代码，运行良好。但我遇到了一些问题。对我来说，没有主页，登录页面是默认页面，一旦用户尝试根据响应登录，它将导航到仪表板，侧边栏仅在受保护的路由中可用。Codesandbox 链接：codesandbox.io/s/protuctedroute-d26tz @Drew

@learner62 我的沙盒中的 \'home\' 路由仅用于提供起点，而不会尝试启动身份验证流程。不过，我还是要提醒您不要将 \'/\' 路径作为身份验证路径。话虽如此，您的沙盒似乎正在运行，您只需确保不要在登录路径 \'/\' 和重定向回 \'/\' 的 PrivateRoute 之间创建渲染循环。

如果您已登录并在受保护的路由上刷新页面，它将使用上面的代码带您离开页面。这是因为在刷新期间上下文最初为空，然后才从数据库中提取数据。有什么建议可以纠正这个问题吗？

@Ufeneiaugustine 添加第三个加载或待处理\'状态\'，既不是\'已认证\'也不是\'未认证\'，这样您可以呈现 null，或加载旋转器，或任何其他\'处理\'UI，直到确定是否应允许用户继续进入页面或是否应将其弹出。

@BeniKeyserman 如果我理解正确的话，您可以使用 \'/\' 路由重定向到已知/已处理的路由，类似于设置默认路由。 PrivateRoutes 布局路由不需要位于 \'/\' 路径上，事实上，如果您不需要布局路由参与路由匹配，那么布局路由可以完全无路径。

对于 v6：

import { Routes, Route, Navigate } from "react-router-dom";

function App() {
  return (
    <Routes>
      <Route path="/public" element={<PublicPage />} />
      <Route
        path="/protected"
        element={
          <RequireAuth redirectTo="/login">
            <ProtectedPage />
          </RequireAuth>
        }
      />
    </Routes>
  );
}

function RequireAuth({ children, redirectTo }) {
  let isAuthenticated = getAuth();
  return isAuthenticated ? children : <Navigate to={redirectTo} />;
}

文档链接： https://gist.github.com/mjackson/d54b40a094277b7afdd6b81f51a0393f

我不知道为什么只有这个代码有效！！以上所有 V6 解决方案均无效。无论如何，谢谢@Yauhen

这是针对 Reactjs 较新的答案

React Router Dom：^ v6

//App.js
<Route path="/"
       element={<HomePage /> } />

<Route path="/dashboard"
       element={<AuthMiddleware> <DashboardPage /> </AuthMiddleware>}
/>

// AuthMiddelware.js
import { Navigate } from "react-router-dom"

export const AuthMiddleware = (props) => { 
    
    const token = true; // get login status here
    
    const { auth=token, children, redirect = '/login' } = props; 

    if (!auth) {
       return <Navigate to={redirect} replace />;
    }
    return children;
 };

如果您想要一种简单的实现方法，那么请使用 App.js 中的 Login，如果用户已登录，则设置用户变量。 如果设置了用户变量，则启动这些路由，否则它将停留在登录页面 。我在我的项目中实现了这个。

  return (
    <div>
      <Notification notification={notification} type={notificationType} />

      {
        user === null &&
        <LoginForm startLogin={handleLogin} />
      }

      {
        user !== null &&
        <NavBar user={user} setUser={setUser} />
      }

      {
        user !== null &&
        <Router>
          <Routes>
            <Route exact path="/" element={<Home />} />
            <Route exact path="/adduser" element={<AddUser />} /> />
            <Route exact path="/viewuser/:id" element={<ViewUser />} />
          </Routes>
        </Router>
      }

    </div>
  )

import { BrowserRouter as Router } from "react-router-dom";        
import { Routes, Route } from "react-router-dom";      
import Home from "./component/home/Home.js";      
import Products from "./component/Products/Products.js";      
import Profile from "./component/user/Profile.js";      
      
import ProtectedRoute from "./component/Route/ProtectedRoute";      
function App() {      
 return (      
    <Router>      
    <Routes>      
        <Route path="/" element={<Home />} />      
        <Route path="/products" element={<Products />} />      
        <Route      
          path="/account"      
          element={      
            <ProtectedRoute  >      
              <Profile />      
            </ProtectedRoute>      
          }      
        />      
      </Routes>      
       </Router>      
  );      
}      
      
//ProtectedRoute       

export default App;      
import React from "react";      
import { useSelector } from "react-redux";      
import { Navigate } from "react-router-dom";      

function ProtectedRoute({ children }) {      
  const { isAuthecated, loading } = useSelector((state) => state.user);      
      
  if (!isAuthecated) {      
    return <Navigate to="/login" replace />;      
  }      
  return children;      
}      
export default ProtectedRoute;      
      

就目前的情况来看，您的答案不够清晰。请编辑以添加更多详细信息，帮助其他人了解此内容如何解决所提问题。您可以在帮助中心找到有关如何撰写良好答案的更多信息。

import { v4 as uuidv4 } from "uuid";

const routes = [
    {
        id: uuidv4(),
        isProtected: false,
        exact: true,
        path: "/home",
        component: param => <Overview {...param} />,
    },
    {
        id: uuidv4(),
        isProtected: true,
        exact: true,
        path: "/protected",
        component: param => <Overview {...param} />,
        allowed: [...advanceProducts], // subscription
    },
    {
        // if you conditional based rendering for same path
        id: uuidv4(),
        isProtected: true,
        exact: true,
        path: "/",
        component: null,
        conditionalComponent: true,
        allowed: {
            [subscription1]: param => <Overview {...param} />,
            [subscription2]: param => <Customers {...param} />,
        },
    },
]

// Navigation Component
import React, { useEffect, useState } from "react";
import { useSelector } from "react-redux";
import { Switch, Route, useLocation } from "react-router-dom";

// ...component logic
<Switch>
    {routes.map(params => {
        return (
            <ProtectedRoutes
                exact
                routeParams={params}
                key={params.path}
                path={params.path}
            />
        );
    })}
    <Route
        render={() => {
            props.setHideNav(true);
            setHideHeader(true);
            return <ErrorPage type={404} />;
        }}
    />
</Switch>

// ProtectedRoute component
import React from "react";
import { Route } from "react-router-dom";
import { useSelector } from "react-redux";

const ProtectedRoutes = props => {
    const { routeParams } = props;
    const currentSubscription = 'xyz'; // your current subscription;
    if (routeParams.conditionalComponent) {
        return (
            <Route
                key={routeParams.path}
                path={routeParams.path}
                render={routeParams.allowed[currentSubscription]}
            />
        );
    }
    if (routeParams.isProtected && routeParams.allowed.includes(currentSubscription)) {
        return (
            <Route key={routeParams.path} path={routeParams.path} render={routeParams?.component} />
        );
    }
    if (!routeParams.isProtected) {
        return (
            <Route key={routeParams.path} path={routeParams.path} render={routeParams?.component} />
        );
    }
    return null;
};

export default ProtectedRoutes;

想要添加亮点永远不要忘记将路径作为 prop 提供给 ProtectedRoute，否则它将不起作用。

这是一个简单的 react-router v6 保护路由。我把所有想要保护的路由都放在 ： 中 routes.js -

const routes = [{ path: "/dasboard", name:"Dashboard", element: <Dashboard/> }]

要呈现路线，只需按如下方式映射它们：-

<Routes>
   {routes.map((routes, id) => {
     return(
     <Route
         key={id}
         path={route.path}
         exact={route.exact}
         name={route.name}
         element={
            localStorage.getItem("token") ? (
                route.element
             ) : (
                <Navigate to="/login" />
             )
         }
     )
   })
  }
</Routes>