如何解决TypeError:无法读取ReactJS中未定义的属性'props'
我正在尝试使用ReactJS创建一个简单的应用程序,但出现此错误,我不知道为什么。
这是我的App.js。
import React from 'react';
import { connect } from 'react-redux';
import Category from './components/Category';
//import News from './components/Noticias';
import './App.css';
function App() {
const { categories } = this.props;
return (
<div className="App">
<Category categories={categories} />
{/*<News />*/}
</div>
);
}
const mapStatetoProps = state => {
const { Categorias: {data: categories}} = state;
return {
categories,}
}
const mapdispatchToProps = dispatch => ({})
export default connect(mapStatetoProps,mapdispatchToProps)(App);
我正在node.js v14.4.0下工作,这是我的package.json,用于检查反应版本,redux版本等。
{
"name": "noticias","version": "0.1.0","private": true,"dependencies": {
"@testing-library/jest-dom": "^4.2.4","@testing-library/react": "^9.3.2","@testing-library/user-event": "^7.1.2","react": "^16.13.1","react-dom": "^16.13.1","react-redux": "^7.2.1","react-scripts": "3.4.3","redux": "^4.0.5","redux-form": "^8.3.6"
},"scripts": {
"start": "react-scripts start","build": "react-scripts build","test": "react-scripts test","eject": "react-scripts eject"
},"eslintConfig": {
"extends": "react-app"
},"browserslist": {
"production": [
">0.2%","not dead","not op_mini all"
],"development": [
"last 1 chrome version","last 1 firefox version","last 1 safari version"
]
}
}
我正在检查,但没有找到错误,您能帮我吗?
解决方法
您可以写这个,
function App({ categories }) {
// const { categories } = this.props;
return (
<div className="App">
<Category categories={categories} />
{/*<News />*/}
</div>
);
}
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