fps计算

<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<title>FPS 计算示例</title>
<style>
#fpsCounter {
position: fixed;
top: 10px;
left: 10px;
padding: 5px 10px;
background: rgba(0, 0, 0, 0.7);
color: #0f0;
font-family: Arial, sans-serif;
border-radius: 5px;
}
</style>
</head>
<body>
<div id="fpsCounter">FPS: 0</div>

<script>
let lastTime = performance.now();
let frame = 0;
let fps = 0;
let lastFpsUpdate = performance.now();

function update() {
const now = performance.now();
frame++;
const delta = now - lastFpsUpdate;

if (delta >= 1000) {
// 每1000毫秒更新一次FPS
fps = (frame / delta) * 1000;
document.getElementById(
"fpsCounter"
).textContent = `FPS: ${fps.toFixed(2)}`;
frame = 0;
lastFpsUpdate = now;
}

requestAnimationFrame(update);
}

// 开始动画循环
requestAnimationFrame(update);
</script>
</body>
</html>
posted @ 2024-12-19 03:31  hh9515  阅读(8)  评论(0)    收藏  举报