我按照教程做了同样的事情，但React不渲染我的应用程序。
谁能看出问题是什么吗?我只是得到一个没有元素的空白页。
这是我的index.js文件:
import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import reportWebVitals from './reportWebVitals';
import App from './App';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<App/>,
document.getElementById('root')
);
reportWebVitals();
这是我的App.js文件
import React from "react";
import Sidebar from "./Sidebar";
function App() {
return(
<div>
<Sidebar>
<a href="/">Home</a>
<a href="/products">Products</a>
<a href="/pricing">Pricing</a>
<a href="/contact">Contact</a>
</Sidebar>
</div>
);
};
export default App;
这是我的Sidebar.js文件
import React from "react";
import "./Sidebar.css";
function Sidebar(props) {
return(
<aside className="Sidebar">
<nav className="Sidebar-nav">
{props.chidren}
</nav>
</aside>
);
};
export default Sidebar;
这是index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="theme-color" content="#000000" />
<meta
name="description"
content="Web site created using create-react-app"
/>
<link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
<!--
manifest.json provides metadata used when your web app is installed on a
user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
-->
<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
<!--
Notice the use of %PUBLIC_URL% in the tags above.
It will be replaced with the URL of the `public` folder during the build.
Only files inside the `public` folder can be referenced from the HTML.
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
work correctly both with client-side routing and a non-root public URL.
Learn how to configure a non-root public URL by running `npm run build`.
-->
<title>React App</title>
</head>
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
<!--
This HTML file is a template.
If you open it directly in the browser, you will see an empty page.
You can add webfonts, meta tags, or analytics to this file.
The build step will place the bundled scripts into the <body> tag.
To begin the development, run `npm start` or `yarn start`.
To create a production bundle, use `npm run build` or `yarn build`.
-->
</body>
</html>
我想补充，它的工作，当我使用一个topMenu和bottomMenu属性，而不是子属性，并把它的a-标签到侧边栏的属性:
我更改了Sidebar.js中的代码部分:
<nav className="Sidebar-nav">
{props.topMenu}
</nav>
<nav className="Sidebar-nav">
{props.bottomMenu}
</nav>
<Sidebar topMenu={
<div>
<a href="/">Home</a>
<a href="/products">Products</a>
</div>
}
bottomMenu={
<div>
<a href="/pricing">Pricing</a>
<a href="/contact">Contact</a>
</div>
}
/>
现在它工作了。但是为什么它对孩子不起作用呢?
更新你的index.js到这个
import { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import App from "./App";
const rootElement = document.getElementById("root");
const root = createRoot(rootElement);
root.render(
<StrictMode>
<App />
</StrictMode>
);