jquery 时间倒数

$(document).ready(function() {
    var countDownDate = new Date("Jan 1, 2024 00:00:00").getTime(); // 设定未来时间点

    function updateCountdown() {
        var now = new Date().getTime();
        var distance = countDownDate - now;

        if (distance < 0) {
            clearInterval(interval);
            $('#countdown').html("EXPIRED");
            return;
        }

        var days = Math.floor(distance / (1000 * 60 * 60 * 24));
        var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
        var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
        var seconds = Math.floor((distance % (1000 * 60)) / 1000);

        $('#countdown').html(days + "d " + hours + "h " + minutes + "m " + seconds + "s ");
    }

    updateCountdown(); // 立即更新一次倒计时
    var interval = setInterval(updateCountdown, 1000); // 每秒更新一次
});