<!DOCTYPE html><html><head><title>实时显示本地电脑时间（精确到毫秒）</title></head><body><h1>本地电脑时间（精确到毫秒）：</h1><h1 id="clock"></h1><script>function updateClock() {const now = new Date();const year = now.getFullYear();const month = String(now.getMonth() + 1).padStart(2, '0');const day = String(now.getDate()).padStart(2, '0');const hours = String(now.getHours()).padStart(2, '0');const minutes = String(now.getMinutes()).padStart(2, '0');const seconds = String(now.getSeconds()).padStart(2, '0');const milliseconds = String(now.getMilliseconds()).padStart(3, '0');const timeString = `${year}-${month}-${day} ${hours}:${minutes}:${seconds} ${milliseconds}`;document.getElementById('clock').textContent = timeString;}setInterval(updateClock, 1);</script></body></html>