<div id="app"></div>
class App extends React.Component {
sayHi(e) {
e.preventDefault()
window.alert('Hello!');
}
render() {
return (
<div>
<a href="https://israynotarray.com/" onClick={ this.sayHi }>點我</a>
</div>
);
}
}
const app = document.querySelector('#app');
const root = ReactDOM.createRoot(app);
root.render(<App />);
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