教学管理平台双十二活动

// HTML部分
<div id="countdown"></div>

// JavaScript部分
function startCountdown(endTime) {
    const countdownElement = document.getElementById('countdown');
    const interval = setInterval(() => {
        const now = new Date().getTime();
        const distance = endTime - now;
        if (distance < 0) {
            clearInterval(interval);
            countdownElement.innerHTML = "EXPIRED";
            return;
        }
        const days = Math.floor(distance / (1000 * 60 * 60 * 24));
        const hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
        const minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
        const seconds = Math.floor((distance % (1000 * 60)) / 1000);
        countdownElement.innerHTML = `${days}d ${hours}h ${minutes}m ${seconds}s`;
    }, 1000);
}

// 设置活动结束时间为双十二当天23:59:59
const endTime = new Date('2023-12-12T23:59:59').getTime();
startCountdown(endTime);