返回时分秒经典练习题

题目

代码实现

<script>
    function countDown(time) {
        var nowTime = +new Date();     //当前时间戳
        var inputTime = +new Date(time);    //用户选择的时间戳
        var times = (inputTime - nowTime) / 1000;    //将毫秒换算为秒
        var d = parseInt(times / 60 / 60 / 24);
        d = d < 10 ? '0' + d : d;
        var h = parseInt(times / 60 / 60 % 24);
        h = h < 10 ? '0' + h : h;
        var m = parseInt(times / 60 % 60);
        m = m < 10 ? '0' + m : m;
        var s = parseInt(times % 60);
        s = s < 10 ? '0' + s : s;
        return d + '天' + h + '时' + m + '分' + s + '秒';
    }
    var now = new Date();
    console.log(now);
    console.log('倒计时'+countDown('2020-11-15 18:00:00'));
</script>

效果如下：