使用 Hooks 的计数器
2025年11月29日
作者：管理员
示例代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>React Hooks 计数器</title>
<script crossorigin src="https://unpkg.com/react@18.3.1/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<style>
body { font-family: system-ui, sans-serif; padding: 20px; }
button { margin: 5px; padding: 8px 16px; font-size: 16px; }
</style>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
function Counter() {
const [count, setCount] = React.useState(0);
return (
<div>
<p>当前计数: {count}</p>
<button onClick={() => setCount(count + 1)}>
增加
</button>
<button onClick={() => setCount(count - 1)}>
减少
</button>
</div>
);
}
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<Counter />);
</script>
</body>
</html>