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;
我不相信我的情况和补救措施在这里讨论，所以我补充。
我有一个函数，它返回一个名为notification的对象
import IconProgress from '../assets/svg/IconProgress';
const getNotificationFromAttachment = (attachment) => {
const notification = {
Icon: IconProcessing,
iconProps: {},
};
...
notification.Icon = {IconProgress};
return notification
}
React期望一个字符串或类/函数作为变量通知的值。图标
所以你所需要做的就是将{IconProgress}改为IconProgress
见下图:
在我的例子中，我花了很多时间来搜索和检查可能的方法，但只有通过这种方式来修复:在导入自定义组件时删除“{”，“}”:
import OrderDetail from './orderDetail';
我的错误做法是:
import { OrderDetail } from './orderDetail';
因为在OrderDetail .js文件中，我将OrderDetail导出为默认类:
class OrderDetail extends Component {
render() {
return (
<View>
<Text>Here is an sample of Order Detail view</Text>
</View>
);
}
}
export default OrderDetail;
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)
