未捕获错误:不变量违反:元素类型无效:期望为字符串(对于内置组件)或类/函数，但got: object

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

我在React上遇到了点问题。Fragment，因为我的react的版本是< 16.2，所以我去掉了它。

2019-07-08 11:48:59

其他回答

对我来说，它是app config json的名称。在index.js中，导入是这样的:

import { AppRegistry } from 'react-native'
import App from './app'
import { name as appName } from './app.json'

AppRegistry.registerComponent(appName, () => App)

React Native不区分'。./app '和'./app.json'。不知道为什么。因此，我已经将app.json的名称更改为app.config.json，这已经解决了问题:

import { AppRegistry } from 'react-native'
import App from './app'
import { name as appName } from './app.config.json'

AppRegistry.registerComponent(appName, () => App)

2022-05-23 19:20:49

我在React上遇到了点问题。Fragment，因为我的react的版本是< 16.2，所以我去掉了它。

2019-07-08 11:48:59

在文件底部导出可以解决这个问题。

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

2019-07-28 13:35:50

就我而言，

//details.js 
import React from 'react'

const Details = (props) =>{
return <h1>Details</h1>
}

export default Details;


//main.js
import React from "react";
import { withRouter } from "react-router";
import {Route,BrowserRouter as Router,Redirect,Switch,Link} from "react-router-dom";
import Details from "./myAccount/details";

const Main = (props) => {
 return (
   <>
        <Switch>
          <Route path="/my-account/details" component={<Details />} />
        </Switch>
   </>

 );
};

export default withRouter(Main);

===========================

Replaced with below one, error got fixed
component={<Details />}  with  component={Details}

2022-05-06 10:01:27

在我的案例中(使用Webpack)，这是以下两者的区别:

import {MyComponent} from '../components/xyz.js';

import MyComponent from '../components/xyz.js';

第二个工作，而第一个造成错误。或者正好相反。

2016-03-28 15:06:33

未捕获错误:不变量违反:元素类型无效:期望为字符串(对于内置组件)或类/函数，但got: object

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