[英]Rendering a React.Component
有人能指出这段代码使用React渲染组件的问题吗? 它不断抛出错误,提示“元素类型无效...检查App的呈现方法”,但我看不到问题。
import React from 'react';
import ReactDOM from 'react-dom';
import App from './components/app';
ReactDOM.render(<App />, document.getElementById('container'));
APP
import React from 'react';
import AppActions from '../actions/app-actions';
import Catalog from './app-catalog';
export default class App extends React.Component {
render(){
return (
<div className="container">
<Catalog />
</div>
)
}
}
目录
import React from 'react';
import AppStore from '../stores/app-store';
import CatalogItem from './app-catalog-item';
function getCatalog(){
return {items: AppStore.getCatalog()}
};
class Catalog extends React.Component {
constructor(){
super();
this.state = getCatalog();
}
render(){
let items = this.state.items.map(item => {
return <CatalogItem key={item.id} item={item} />
});
return (
<div className="row">
{items}
</div>
)
}
}
任何帮助将非常感激。
您只需要export default
Catalog
export default
:
export default class Catalog extends React.Component {
...
否则,当您使用import
语句时,将不会导入任何内容:
import Catalog from './app-catalog';
将export
添加到Catalog
export default class Catalog extends React.Component {
}
因为现在从catalog
中没有要import
,因此
import Catalog from './app-catalog';
您将获得undefined
和undefined
的无效的React组件,这就是为什么您会得到错误
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