动态时间倒计时js

// 设置倒计时的结束时间
let endTime = new Date(new Date().getTime() + 60 * 1000); // 当前时间加上1分钟

// 更新倒计时的函数
function updateCountdown() {
    let now = new Date().getTime();
    let distance = endTime - now;

    if (distance < 0) {
        clearInterval(interval);
        document.getElementById("countdown").innerHTML = "倒计时结束";
        return;
    }

    let minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    let seconds = Math.floor((distance % (1000 * 60)) / 1000);

    document.getElementById("countdown").innerHTML = minutes + "分 " + seconds + "秒 ";
}

// 每秒更新倒计时
let interval = setInterval(updateCountdown, 1000);