JS 倒计时秒杀

1、HTML代码：

<div class="box">
    <img src="timg.jpg" alt=""/>
    <h2>商品：钢琴</h2>
    <p>结束时间是：2019-6-30</p>
    <p>原价<del>99999</del>现价$11111</p>
    <p>距离秒杀开始还剩:<span id="timer"></span></p>
</div>

2、简单给点css样式：

<style>
    .box{
        width: 600px;
        height: 600px;
        background: #fff;
        margin: 0 auto;
        border: 1px solid #54FFFA;
    }
   img{
        width: 100%;
    }
</style>

3、js代码：

<script>
    var timer=document.getElementById("timer");

    setInterval(function(){

    var date=new Date();
    var lastDate=new Date("2019-6-30");

    var time=(lastDate-date)/1000/60/60/24;
    var day=Math.floor(time);
    var hour=Math.floor((time-day)*24);
    var minutes=Math.floor(((time-day)*24-hour)*60);
    var seconds=Math.floor((((time-day)*24-hour)*60-minutes)*60);

       timer.innerHTML =day+'天'+hour+'小时'+minutes+'分钟'+seconds+'秒';
    },1000);

</script>

4、效果图;

JS 倒计时秒杀