页面多个倒计时

   <p class="times dp-flex" style="justify-content: flex-start;">交易时间剩余：<span
                                                class="timer8">01:52:23</span></p>

 // 页面多个倒计时
        var aTime = [3600, 3800, 899890, 452334, 34, 24, 34343, 233242, 809];
        for (var i = 0; i < aTime.length; i++) {
            (function (i) {
                var obj = 'timer' + i;
                countDown(aTime[i], function (msg) {
                    var timeDom = document.getElementsByClassName(obj)
                    timeDom[0].textContent = msg;
                })
            })(i)
        }
        function countDown(maxtime, fn) {
            var timer = setInterval(function () {
                if (!!maxtime) {
                    var day = Math.floor(maxtime / 86400),
                        hour = Math.floor((maxtime % 86400) / 3600),
                        minutes = Math.floor((maxtime % 3600) / 60),
                        seconds = Math.floor(maxtime % 60),
                        msg = (hour < 10 ? '0' + hour : hour) + ":" + (minutes < 10 ? '0' + minutes : minutes) + ":" + (seconds < 10 ? '0' + seconds : seconds);
                    fn(msg);
                    --maxtime;
                } else {
                    clearInterval(timer);
                }
            }, 1000);
        }