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Contador.html
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<html>
<head>
<title>Teste 2 - React Profissional</title>
</head>
<body>
<div id="root"></div>
<script src="https://unpkg.com/@babel/standalone/babel.min.js" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.8.3/polyfill.min.js" integrity="sha256-9RnErXq8KdNdvZ7471e/mnJkwhHwFvR7OPJwMdD4E9c=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.12.0/umd/react.production.min.js" integrity="sha256-Ef0vObdWpkMAnxp39TYSLVS/vVUokDE8CDFnx7tjY6U=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.11.0/umd/react-dom.production.min.js" integrity="sha256-zuSDvIPhgPCvDFw3HdbA58QUOOGxPbs4llUvBOPxvjY=" crossorigin="anonymous"></script>
<script type="text/babel">
const Counter = ({value}) => (
<p>Contador: {value}</p>
);
const App = () => {
const [counter, setCounter] = React.useState(0);
return (
<div>
<Counter value={counter} />
<button
type="button"
onClick={() => {
setCounter(counter + 1)
}}>
Somar 1
</button>
</div>
);
};
ReactDOM.render(
<App />,
document.getElementById("root"));
</script>
</body>
</html>