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honai/request-animation-frame.html

Last active May 3, 2019 21:36
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JSのRequestAnimationFrameのサンプル
Raw
request-animation-frame.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>RequestAnimationFrame</title>
</head>
<body>
<div id="animate-div">アニメーション</div>
</body>
<script>
var start = null;
var element = document.getElementById('animate-div');
element.style.position = 'absolute';
function step(timestamp) {
if (!start) start = timestamp;
var progress = timestamp - start;
element.style.left = Math.min(progress / 10, 200) + 'px';
if (progress < 2000) {
window.requestAnimationFrame(step);
}
}
window.requestAnimationFrame(step);
</script>
</html>
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