面试题之（js实现当年剩余时间倒计时程序）

<script>
    function counter() {

        var date = new Date();

        var year = date.getFullYear();

        var date2 = new Date(year, 12, 31, 23, 59, 59);

        /*转换成秒*/
        var time = (date2 - date) / 1000;

        var day = Math.floor(time / (24 * 60 * 60))


        var hour = Math.floor(time % (24 * 60 * 60) / (60 * 60))

        var minute = Math.floor(time % (24 * 60 * 60) % (60 * 60) / 60);

        var second = Math.floor(time % (24 * 60 * 60) % (60 * 60) % 60);

        var str = year + "年还剩" + day + "天" + hour + "时" + minute + "分" + second + "秒";

        console.log(str);

    }

    window.setInterval("counter()", 1000);
</script>