「React入門」ReactDOM.render()で日付の時間を表示するサンプル
説明
toLocaleTimeString() メソッドは、この Date オブジェクトの「時刻」部を表す言語に依存した文字列を返します。
使用例
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="/react/16.4.0/umd/react.development.js"></script>
<script src="/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="timeobj"></div>
<script type="text/babel">
function tick() {
const element = (
<div>
<h1>Hello, world!</h1>
<h2>時刻： {new Date().toLocaleTimeString()}.</h2>
</div>
);
ReactDOM.render(
element,
document.getElementById('timeobj')
);
}
setInterval(tick, 1000);
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="/react/16.4.0/umd/react.development.js"></script>
<script src="/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="timeobj"></div>
<script type="text/babel">
function tick() {
const element = (
<div>
<h1>Hello, world!</h1>
<h2>時刻： {new Date().toLocaleTimeString()}.</h2>
</div>
);
ReactDOM.render(
element,
document.getElementById('timeobj')
);
}
setInterval(tick, 1000);
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="/react/16.4.0/umd/react.development.js"></script>
<script src="/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="timeobj"></div>
<script type="text/babel">
function tick() {
const element = (
<div>
<h1>Hello, world!</h1>
<h2>時刻： {new Date().toLocaleTimeString()}.</h2>
</div>
);
ReactDOM.render(
element,
document.getElementById('timeobj')
);
}
setInterval(tick, 1000);
</script>
</body>
</html>