反应。类型无效——期望为字符串

尝试得到react-router (v4.0.0)和react-hot loader (3.0.0-beta.6)很好地发挥，但在浏览器控制台得到以下错误:

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.

index.js:

import React from 'react';
import ReactDom from 'react-dom';
import routes from './routes.js';
require('jquery');
import 'bootstrap/dist/css/bootstrap.min.css';
import 'bootstrap/dist/js/bootstrap.min.js';
import './css/main.css';

const renderApp = (appRoutes) => {
    ReactDom.render(appRoutes, document.getElementById('root'));
};

renderApp( routes() );

routes.js:

import React from 'react';
import { AppContainer } from 'react-hot-loader';
import { Router, Route, browserHistory, IndexRoute } from 'react-router';
import store from './store/store.js';
import { Provider } from 'react-redux';
import App from './containers/App.jsx';
import Products from './containers/shop/Products.jsx';
import Basket from './containers/shop/Basket.jsx';

const routes = () => (

    <AppContainer>
        <Provider store={store}>
            <Router history={browserHistory}>
                <Route path="/" component={App}>
                    <IndexRoute component={Products} />
                    <Route path="/basket" component={Basket} />
                </Route>
            </Router>
        </Provider>
    </AppContainer>

);

export default routes;

当前回答

您需要了解命名导出和默认导出。我什么时候应该用大括号导入ES6 ?

在我的例子中，我通过改变

import Provider from 'react-redux'

import { Provider } from 'react-redux'

2018-03-13 15:21:42

其他回答

您需要了解命名导出和默认导出。我什么时候应该用大括号导入ES6 ?

在我的例子中，我通过改变

import Provider from 'react-redux'

import { Provider } from 'react-redux'

2018-03-13 15:21:42

我正在开发的应用程序将react组件的名称作为小部件配置存储在浏览器存储中。其中一些组件被删除了，应用程序仍在试图呈现它们。通过清除浏览器缓存，我能够解决我的问题。

2021-02-26 19:29:00

对我来说，我导入阿凡达就像进口{ 《阿凡达》 }从'react-native-paper'; 在渲染时，我在TouchableOpacity中包装了Avatar元素，这导致了上述问题。移除TouchableOpacity后，一切正常。 <阿凡达。图像 ={{来源 uri:“……” }} 大小= {80} />

2022-04-25 09:00:27

对于我来说，这发生在我试图将命名导入作为默认导入时，所以我得到了这个错误

import ProductCard from '../../../components/ProductCard' // that what caused the issue

Error: Element 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, or you might have mixed up default and named imports.

Check the render method of `TopVente`.

所以我必须通过名称导入来修复它

import { ProductCard } from '../../../components/ProductCard'

2022-04-13 19:06:29

试试这个

npm i react-router-dom@next

在你的App.js中

import { BrowserRouter as Router, Route } from 'react-router-dom'

const Home = () => <h1>Home</h1>

const App = () =>(
  <Router>
    <Route path="/" component={Home} />
  </Router>
)

export default App;

2017-05-09 11:25:16

反应。类型无效——期望为字符串

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