我得到这个错误:

Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

这是我的代码:

var React = require('react')
var ReactDOM =  require('react-dom')
var Router = require('react-router')
var Route = Router.Route
var Link = Router.Link

var App = React.createClass({
  render() {
    return (
      <div>
        <h1>App</h1>
        <ul>
          <li><Link to="/about">About</Link></li>
        </ul>
      </div>
    )
  }
})

var About = require('./components/Home')
ReactDOM.render((
  <Router>
    <Route path="/" component={App}>
      <Route path="about" component={About} />
    </Route>
  </Router>
), document.body)

我的家。jsx文件:

var React = require('react');
var RaisedButton = require('material-ui/lib/raised-button');

var Home = React.createClass({
  render:function() {
    return (
        <RaisedButton label="Default" />
    );
  },
});

module.exports = Home;

当前回答

我想为这个问题补充一个案例。我通过交换导入顺序来解决这个问题,例如在之前的混合导入中:

import { Label } from 'components/forms/label';
import Loader from 'components/loader/loader';
...
import Select from 'components/select/select'; // <----- the error happen

变更后:

import Select from 'components/select/select'; // <----- Fixed
import { Label } from 'components/forms/label';
import Loader from 'components/loader/loader';
...

其他回答

您需要导出default或require(path).default

var About = require('./components/Home').default

我想为这个问题补充一个案例。我通过交换导入顺序来解决这个问题,例如在之前的混合导入中:

import { Label } from 'components/forms/label';
import Loader from 'components/loader/loader';
...
import Select from 'components/select/select'; // <----- the error happen

变更后:

import Select from 'components/select/select'; // <----- Fixed
import { Label } from 'components/forms/label';
import Loader from 'components/loader/loader';
...

我通过import App from './ App /'获得;期望它导入。/app/index.js,但它却导入了。/app.json。

在我的例子中,导入是由于库而隐式发生的。

我设法通过改变来解决它

导出类Foo

to

导出默认类Foo。

在文件底部导出可以解决这个问题。

const IndicatorCloak = (props) => { ... }
export default IndicatorCloak;