Link' is not defined react/jsx-no-undef这是什么情况呢

Question

如题报错
入口文件

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import {Router, Route, Link}from 'react-router';
import registerServiceWorker from './registerServiceWorker';
import Home from './components/home'

// ReactDOM.render(<App />, document.getElementById('root'));

ReactDOM.render(
  <Router>
    <Route path = "/" component={App}>
      <Route path = '/home' component={Home}></Route>
    </Route>
  </Router>
)

registerServiceWorker();

App.js

import React, { Component } from 'react';
// import logo from './logo.svg';
import './App.css';

class App extends Component {
  render() {
    return (
      <div className="App">
        <h1>hello,world</h1>
        <Link to="/home">点击点击</Link>
      </div>
    );
  }
}

export default App;

Answer 1

appjs没引入Link

Answer 2

我也是这样。虽然能解决，就是有点不理解，难道每个使用link的组件都要引入一次吗。不能再index.js或者router.js引入么