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

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

其他回答

@Balasubramani M救了我。想再加一个来帮助人们。当你把太多的东西粘在一起，对版本漫不经心时，这就是问题所在。我更新了material-ui的一个版本，需要更改

import Card, {CardContent, CardMedia, CardActions } from "@material-ui/core/Card";

import Card from '@material-ui/core/Card';
import CardActions from '@material-ui/core/CardActions';
import CardContent from '@material-ui/core/CardContent';
import CardMedia from '@material-ui/core/CardMedia';

2018-07-21 15:47:40

在我的例子中，它最终是像这样导入的外部组件:

import React， {Component}

然后声明如下:

导出默认类MyOuterComponent

其中一个内部组件导入了React bare:

import React from

用虚线表示声明:

导出默认类MyInnerComponent

2018-12-14 20:59:03

当我更改此代码时，错误已被修复

AppRegistry.registerComponent(appName, App );

到此代码:

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

2022-03-10 17:25:52

我也犯了同样的错误: 错误修复!!!!

我使用'react-router-redux' v4，但她不好.. 在npm安装react-router-redux@next 我在"react-router-redux"上:"^5.0.0-alpha.9"，

这就是工作

2018-05-02 08:20:52

确保只返回一个PARENT - CHILD

这是可行的

<div>
    <p> Something here </p>
</div>

这行不通

<div>
    <p> Something here </p>
</div>
<div>
    <p> Something else here </p>
</div>

2022-08-19 15:35:02

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

推荐文章

最新文章

标签