react嵌套路由，并设置默认子路由

弄了好长时间，记得之前写的时候没问题呀，现在不知道哪里出现问题，后来才发现 是 exact  和 跳转子路由 路径的问题，哎

App.js

import React, {lazy, Suspense}  from "react";
import { Switch, Route } from 'react-router-dom';
function App() {
  return (
    <div className="App">
      <Suspense fallback={React.Fragment}>
        <Switch><Route path="/" exact component={lazy(() => import('./views/Login'))}>Route>
　　　　　　
　　　　　　// 切记！！！！！！  这里不能加 exact  否则子路由匹配不进去
          <Route path="/MyService" component={lazy(() => import('./views/MyService'))}>Route>

          <Route path="*" component={lazy(() => import('./views/Error/Error'))}>Route>
        Switch>
      Suspense>
    div>
  );
}

export default App;

MyService/index.js

import React from 'react';
import { Switch, Route, useHistory } from 'react-router-dom';
import { Button } from 'antd-mobile';
// import routes from 'src/router';
import dent from './dent/dent'
import high from './high/high'

function MyService () {
  const history = useHistory()
  return (
    <div>
      MyService
　　　　// !!!!!!    这里切记写上完整的路由路径，，即 父路由 + 子路由
      <Button type="primary" onClick={() => history.push('/MyService/dent')}>AButton>
      <Button type="primary" onClick={() => history.push('/MyService/high')}>BButton>
      <Switch>
　　　　
　　　　　// !!!!!!      这里切记写上完整的路由路径，，即 父路由 + 子路由

　　　　　　<Route path="/MyService/dent" component={dent}>Route> 
　　　　　　<Route path="/MyService/high" component={high}>Route> 
　　　　Switch> 
　　　div> 
　　) 
} 

export default MyService;

MyService/dent/dent.jsx

import React from 'react';

function dent () {
  return (
    <div>
      dent
    div>
  )
}

export default dent;

MyService/high/high.jsx

import React from 'react';

function high () {
  return (
    <div>
      high
    div>
  )
}

export default high;

默写子路由 ，修改 MyService/index.js

import React from 'react';
import { Switch, Route, useHistory } from 'react-router-dom';
import { Button } from 'antd-mobile';
// import routes from 'src/router';
import dent from './dent/dent'
import high from './high/high'

function MyService () {
  const history = useHistory()
  return (
    <div>
      MyService
      <Button type="primary" onClick={() => history.push('/MyService/')}>AButton>
      <Button type="primary" onClick={() => history.push('/MyService/high')}>BButton>
      <Switch>
        <Route exact path="/MyService/" component={dent}>Route>
        <Route path="/MyService/high" component={high}>Route>
      Switch>
    div>
  )
}

export default MyService;

参考

https://www.cnblogs.com/yuyujuan/p/10140264.html