js倒计时功能

js：

function TimeDown(id, endDateStr) {
        //结束时间
        var endDate = new Date(endDateStr);
        //当前时间
        var nowDate = new Date();
        //相差的总秒数
        var totalSeconds = parseInt((endDate - nowDate) / 1000);
        //天数
        var days = Math.floor(totalSeconds / (60 * 60 * 24));
        //取模（余数）
        var modulo = totalSeconds % (60 * 60 * 24);
        //小时数
        var hours = Math.floor(modulo / (60 * 60));
        modulo = modulo % (60 * 60);
        //分钟
        var minutes = Math.floor(modulo / 60);
        //秒
        var seconds = modulo % 60;
        //输出到页面
        document.getElementById(id).innerHTML = "还剩:" + days + "天" + hours + "小时" + minutes + "分钟" + seconds + "秒";
        //延迟一秒执行自己
        setTimeout(function () {
            TimeDown(id, endDateStr);
        }, 1000)
    }

html：

<div id="show">div>
<script type="text/javascript">
    TimeDown("show", "2019-9-13 8:00:00");
script>

 

转载于:https://www.cnblogs.com/weixiaofantasy/p/11418975.html