reactjs - React Router Redux ("React.createElement: type is invalid"错误的问题)

Question

我在设置 React-Router-Redux 时遇到一些问题。我只是按照 https://github.com/ReactTraining/react-router/tree/master/packages/react-router-redux#usage 上的基本示例进行操作.

我的 App.jsx 看起来像这样:

import React, { Component } from 'react';
import { Route, Switch } from 'react-router-dom';
import { Provider } from 'react-redux';
import { ConnectedRouter } from 'react-router-redux';
import createHistory from 'history/createBrowserHistory';

import Home from './containers/Home';
import About from './containers/About';
import store from './store';

const history = createHistory();

class App extends Component {
  render() {
    return (
      <Provider store={store}>
        <ConnectedRouter history={history}>
          <div>
            <Route exact path="/" component={Home}/>
            <Route path="/about" component={About}/>
          </div>
        </ConnectedRouter>
      </Provider>
    );
  }
}

export default App;

当我保存此内容时，出现以下错误:

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.

Check your code at App.js:25.

第 25 行是: <ConnectedRouter history={history}>

有人可以帮我吗？

这些是我的依赖项:

"react": "^15.6.1",
"react-dom": "^15.6.1",
"react-redux": "^5.0.6",
"react-router": "^4.2.0",
"react-router-dom": "^4.2.2",
"react-router-redux": "^4.0.8",
"history": "^4.7.2",
"redux": "^3.7.2",

Answer 1

ConnectedRouter 组件可用于 react-router-redux 版本 5。查看 this issue 。从您的依赖项中我们可以看到，您当前使用的是 react-router-redux 版本 4。

所以你应该这样升级你的 react-router-redux 包:

如果您使用npm:

npm install react-router-redux@next

或者如果您使用yarn:

yarn add react-router-redux@next