npm install http-proxy-middleware --save
或
cnpm i http-proxy-middleware -S

const proxy = require('http-proxy-middleware');

module.exports = function(app) {
  app.use(proxy('/api', { target: 'http://localhost:5000/' }));
};

npm install react-router-dom --save
或
cnpm install react-router-dom --save
cnpm i react-router-dom -S

import React from 'react';
import { BrowserRouter as Router, Route } from 'react-router-dom';
import YourComponent from 'your-component-path';

export default function () {
  return (
    <Router>
      <Route path='/' component={YourComponent} />
    </Router>
  );
}