react-router 报错The prop `history` is marked as required in `Router`, but its val

在使用react-router(4.3.1)构建react路由时，进入首页发现报错

Warning: Failed prop type: The prop `history` is marked as required in `Router`, but its value is `undefined`.
    in Router (created by ReactRouter)
    in ReactRouter

检查代码

import React from 'react';
import {Route,Router,hashHistory} from 'react-router';
import App from '../App';
import Add from '../pages/Add';
import Modify from '../pages/Modify';
import Delete from '../pages/Delete';
import Query from '../pages/Query';

export default class ReactRouter extends React.Component{
  render(){
    return (
    <Router history={hashHistory}>
      <Route path='/'>
        <Route path='app' component={App}>
          <Route path='delete' component={Delete} />
          <Route path='add' component={Add} />
          <Route path='modify' component={Modify} />
          <Route path='query' component={Query} />
        </Route>
      </Route>
    </Router>)
  }
}

发现已经添加了history这个属性，那么为什么还会报这个错误呢 这是因为引入的react-router版本是4的，所以这种老式写法不再支持，修改成V4新版本，使用react-router-dom库后显示正常。