Ejemplo: contador de números html
function animateValue(obj, start, end, duration) {
let startTimestamp = null;
const step = (timestamp) => {
if (!startTimestamp) startTimestamp = timestamp;
const progress = Math.min((timestamp - startTimestamp) / duration, 1);
obj.innerHTML = Math.floor(progress * (end - start) + start);
if (progress < 1) {
window.requestAnimationFrame(step);
}
};
window.requestAnimationFrame(step);
}
const obj = document.getElementById("value");
animateValue(obj, 0, 1220, 5000);
const obj2 = document.getElementById("value2");
animateValue(obj2, 0, 520, 5000);
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