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index.html
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index.html
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<!DOCTYPE html>
<html>
<body>
<div id="root"></div>
</body>
<!-- This setup is not suitable for production. -->
<!-- Only use it in development! -->
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<script async src="https://ga.jspm.io/npm:[email protected]/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"react": "https://esm.sh/react?dev",
"react-dom/client": "https://esm.sh/react-dom/client?dev"
}
}
</script>
<script type="text/babel" data-type="module">
import React, { StrictMode } from 'react';
import { createRoot } from 'react-dom/client';
import { useState } from 'react';
let App = function MyApp() {
const [count, setCount] = useState(0);
function handleClick() {
setCount(count + 1);
}
return (
<div>
<h1>Counters that update together</h1>
<MyButton count={count} onClick={handleClick} />
<MyButton count={count} onClick={handleClick} />
</div>
);
}
function MyButton({ count, onClick }) {
return (
<button onClick={onClick}>
Clicked {count} times
</button>
);
}
const root = createRoot(document.getElementById('root'));
root.render(
<StrictMode>
<App />
</StrictMode>
);
</script>
<style>
* {
box-sizing: border-box;
}
body {
font-family: sans-serif;
margin: 20px;
padding: 0;
}
h1 {
margin-top: 0;
font-size: 22px;
}
h2 {
margin-top: 0;
font-size: 20px;
}
h3 {
margin-top: 0;
font-size: 18px;
}
h4 {
margin-top: 0;
font-size: 16px;
}
h5 {
margin-top: 0;
font-size: 14px;
}
h6 {
margin-top: 0;
font-size: 12px;
}
code {
font-size: 1.2em;
}
ul {
padding-inline-start: 20px;
}
button {
display: block;
margin-bottom: 5px;
}
</style>
</html>