<script>
const arrow = document.querySelector('.arrow');
const speed = document.querySelector('.speed-value');
navigator.geolocation.watchPosition((data) => {
console.log(data);
speed.textContent = data.coords.speed;
arrow.style.transform = `rotate(${data.coords.heading}deg)`;
}, (err) => {
console.error(err);
});
</script>
看影片追技術