react router v4路由匹配可选参数

<Route path="detail/:bookid(/:page)" element={<Detail />} />

react router v5路由匹配可选参数

<Route path="detail/:bookid/:page？" element={<Detail />} />

react router v6路由匹配可选参数

<Route path="detail/:bookid">
    <Route path=":page" element={<Detail />} />
    <Route path="" element={<Detail />} />
</Route>