React Router失败的道具“历史记录”，未定义

Question

我一直在跟踪Tyler Mcginnis的教程，并用React
Router遇到了麻烦，尤其是历史记录。我最终逐字复制了他的代码只是为了看看是否只有我一个人，但我仍然

Warning: React.createElement: type is invalid -- expected a string (for built-
in components) or a class/function (for composite components) but got:
undefined. You likely forgot to export your component from the file it's 
defined in.

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

Uncaught TypeError: Cannot read property 'location' of undefined
at new Router (index_bundle.js:8347)
at index_bundle.js:19079
at measureLifeCyclePerf (index_bundle.js:18859)
at ReactCompositeComponentWrapper._constructComponentWithoutOwner (index_bundle.js:19078)
at ReactCompositeComponentWrapper._constructComponent (index_bundle.js:19064)
at ReactCompositeComponentWrapper.mountComponent (index_bundle.js:18972)
at Object.mountComponent (index_bundle.js:4070)
at ReactCompositeComponentWrapper.performInitialMount (index_bundle.js:19155)
at ReactCompositeComponentWrapper.mountComponent (index_bundle.js:19042)
at Object.mountComponent (index_bundle.js:4070)

实现是：

var React = require('react');
var ReactRouter = require('react-router');
var Router = ReactRouter.Router;
var Route = ReactRouter.Route;
var hashHistory = ReactRouter.hashHistory;
var IndexRoute = ReactRouter.IndexRoute;
var Main = require('../components/Main');
var Home = require("../components/Home");
var PromptContainer = require('../containers/PromptContainer');

var routes = (
  <Router history={hashHistory}>
    <Route path='/' component={Main}>
      <IndexRoute component={Home} />
      <Route path='playerOne' header='Player One' component={PromptContainer} />
      <Route path='playerTwo/:playerOne' header='Player Two' component={PromptContainer} />
    </Route>
  </Router>
);

module.exports = routes;

我注意到的是模块hashHistory中不存在react- router，而是模块createBrowserHistory内部history。遵循找到的API文档，我认为必须通过以下位置调用它：

var BrowserHistory = require('history/createBrowserHistory);
const history = createBrowserHistory();

这样做会产生createBrowserHistory is not a function错误。删除括号，会导致与上述历史记录相同的错误undefined。

当我记录历史记录时，绝对是不确定的，这使我相信问题与import语句有关，但是控制台不会告诉我ReactRouter.hashHistory找不到吗？

我知道本教程已经使用一年了，我可能还不知道对API所做的更改，这就是我的问题所在。任何帮助表示赞赏！

Answer 1

路由器v4有点不同

HashHistory

import { HashRouter as Router, Route } from 'react-router-dom'; 
import App from './components/App';

render(( 
  <Router> 
    <Route exact path="/" component={App} /> 
  </Router> ), 
document.getElementById('root'));

要么 BrowserHistory

import { BrowserRouter as Router, Route } from 'react-router-dom'; 
import App from './components/App';

render(( 
  <Router> 
    <Route exact path="/" component={App} /> 
  </Router> ), 
document.getElementById('root'));