前端项目实战36-添加加载优化效果
<Route path='/' element={<React.Suspense fallback={<Loading/>}>
<App />
</React.Suspense> }>
<Route path='/user' element={<React.Suspense fallback={<Loading/>}>
<UserPage />
</React.Suspense>}></Route>
<Route path='/role' element={<React.Suspense fallback={<Loading/>}>
<RolePage />
</React.Suspense>}></Route>

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