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;
除了进口/出口问题提到。我发现使用React.cloneElement()向子元素添加道具,然后渲染它给了我同样的错误。
我不得不改变:
render() {
const ChildWithProps = React.cloneElement(
this.props.children,
{ className: `${PREFIX}-anchor` }
);
return (
<div>
<ChildWithProps />
...
</div>
);
}
to:
render() {
...
return (
<div>
<ChildWithProps.type {...ChildWithProps.props} />
</div>
);
}
有关更多信息,请参阅React.cloneElement()文档。
@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';
https://github.com/rackt/react-router/blob/e7c6f3d848e55dda11595447928e843d39bed0eb/examples/query-params/app.js#L4
路由器也是react-router的属性之一。
所以改变你的模块需要这样的代码:
var reactRouter = require('react-router')
var Router = reactRouter.Router
var Route = reactRouter.Route
var Link = reactRouter.Link
如果你想使用ES6语法的链接使用(导入),使用babel作为助手。
顺便说一句,为了让你的代码正常工作,我们可以添加{this.props。children}在App中,
就像
render() {
return (
<div>
<h1>App</h1>
<ul>
<li><Link to="/about">About</Link></li>
</ul>
{this.props.children}
</div>
)
}