useRoutes 
类型声明
tsx
declare function useRoutes(
  routes: RouteObject[],
  location?: Partial<Location> | string;
): React.ReactElement | null;declare function useRoutes(
  routes: RouteObject[],
  location?: Partial<Location> | string;
): React.ReactElement | null;useRoutes钩子的功能上等同于 <Routes>,但它使用 JavaScript 对象而不是 <Route>元素 元素来定义路由。这些对象具有与普通 <Route> 元素相同的属性,但不需要 JSX。
useRoutes 的返回值要么是一个有效的 React 元素,可以用来呈现路由树;要么是 null (如果没有匹配的元素)。
jsx
import * as React from "react";
import { useRoutes } from "react-router-dom";
function App() {
  let element = useRoutes([
    {
      path: "/",
      element: <Dashboard />,
      children: [
        {
          path: "messages",
          element: <DashboardMessages />,
        },
        { path: "tasks", element: <DashboardTasks /> },
      ],
    },
    { path: "team", element: <AboutPage /> },
  ]);
  return element;
}import * as React from "react";
import { useRoutes } from "react-router-dom";
function App() {
  let element = useRoutes([
    {
      path: "/",
      element: <Dashboard />,
      children: [
        {
          path: "messages",
          element: <DashboardMessages />,
        },
        { path: "tasks", element: <DashboardTasks /> },
      ],
    },
    { path: "team", element: <AboutPage /> },
  ]);
  return element;
}