code-examples/2024/12/react_demo1/src/App.jsx

66 lines
1.9 KiB
JavaScript

import {useEffect, useState} from 'react'
import reactLogo from './assets/react.svg'
import viteLogo from '/vite.svg'
import './App.css'
import styles from './App.module.scss';
import Item from './Item.jsx';
import AppInfoCtx from "./AppInfoCtx.js";
function App() {
const [count, setCount] = useState(0);
const [notification, setNotification] = useState("");
useEffect(() => {
console.log("Executed on mount")
return () => {
console.log('Executed on unmount');
}
}, []);
let items = [];
for (let i = 0; i < count; i++) {
items.push(
<Item key={i} pos={i} callback={setNotification}/>
);
}
return (
<>
<h3>{notification}</h3>
<div>
<a href="https://vite.dev" target="_blank">
<img src={viteLogo} className="logo" alt="Vite logo"/>
</a>
<a href="https://react.dev" target="_blank">
<img src={reactLogo} className="logo react" alt="React logo"/>
</a>
</div>
<h1>Vite + React</h1>
<div className="card">
<AppInfoCtx.Provider value="app-info-1">
<ul>
{items}
</ul>
</AppInfoCtx.Provider>
<AppInfoCtx.Provider value="app-info-2">
<ul>
{items}
</ul>
</AppInfoCtx.Provider>
<button className={styles.item} onClick={() => setCount((count) => count + 1)}>
count is {count}
</button>
<p>
Edit <code>src/App.jsx</code> and save to test HMR
</p>
</div>
<p className="read-the-docs">
Click on the Vite and React logos to learn more
</p>
</>
)
}
export default App