JS结束时间与当前时间间隔

实现内容：

1、时间戳 1587024986952 转成年月日时分秒 2020-04-16 16:16:46

2、当前时间new Date()转成年月日时分秒2019-04-17 10:27:27

3、2020-5-16 17:00:00与当前时间new Date()比较时间差

4、2020-5-16 17:00:00 与 2020-04-16 16:21:53 的时间差

效果：

代码1：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>1、JS结束时间与当前时间间隔</title>

</head>

<body>

<div class='divClass' id='timeCont'>

    <p>当前时间   <span id='nowTime'></span></p>

    <p>结束时间   <span  id='end'></span></p>

    <p style='background:#f00;width: 300px;line-height: 2rem;'>相差时间   <span  id='interval'></span></p>

</div>

<script>

    //1、当前时间new Date()转成年月日时分秒2019-04-17 10:27:27

    function time(now){

        var yy = now.getFullYear(); //年

        var mm = now.getMonth() + 1; //月

        var dd = now.getDate(); //日

        var hh = now.getHours(); //时

        var ii = now.getMinutes(); //分

        var ss = now.getSeconds(); //秒

        var time = yy + "-";

        if (mm < 10) time += "0";

        time += mm + "-";

        if (dd < 10) time += "0";

        time += dd + " ";

        if (hh < 10) time += "0";

        time += hh + ":";

        if (ii < 10) time += '0';

        time += ii + ":";

        if (ss < 10) time += '0';

        time += ss;

        return time;

    }

    setInterval(function(){

        var nowTime =  time(new Date())

        var end_time = '2020-5-16 17:00:00';

        document.querySelector('#nowTime').innerHTML = nowTime;

        document.querySelector('#end').innerHTML = end_time;

        document.querySelector('#interval').innerHTML = timeDown(end_time);

    },1000)

    // 2、结束时间2020-5-16 17:00:00与当前时间new Date()比较时间差

    function timeDown(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

            this.timeCon=days + " 天 " + hours + " 小时 " + minutes + " 分 " + seconds + " 秒";

            return this.timeCon;

    }

</script>

</body>

</html>

代码二：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>2、JS结束时间与当前时间间隔</title>

</head>

<body>

<div class='divClass' id='timeCont'>

    <p>当前时间   <span id='nowTime'></span></p>

    <p>结束时间   <span  id='end'></span></p>

    <p style='background:#f00;width: 300px;line-height: 2rem;'>相差时间   <span  id='interval'></span></p>

</div>

<script>

    //1、时间戳 1587024986952 转成年月日时分秒 2020-04-16 16:16:46

    function timestampToTime(timestamp) {

        var date = new Date();//时间戳为10位需*1000，时间戳为13位的话不需乘1000

        var Y = date.getFullYear() + '-';

        var M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '-';

        var D = (date.getDate() < 10 ? '0'+date.getDate() : date.getDate()) + ' ';

        var h = (date.getHours() < 10 ? '0'+date.getHours() : date.getHours()) + ':';

        var m = (date.getMinutes() < 10 ? '0'+date.getMinutes() : date.getMinutes()) + ':';

        var s = (date.getSeconds() < 10 ? '0'+date.getSeconds() : date.getSeconds());

        strDate = Y+M+D+h+m+s;

        return strDate;

    };

    // 2020-5-16 17:00:00 与 2020-04-16 16:21:53 的时间差

    function timeInterval(endTime,startTime){

        var time1=startTime.replace(new RegExp(/-/gm) ,"/");

        var time2=endTime.replace(new RegExp(/-/gm) ,"/");

        var stime=new Date(time1).getTime();

        var etime = new Date(time2).getTime();

        var usedTime = etime - stime;

        var days=Math.floor(usedTime/(24*3600*1000));

        var leave1=usedTime%(24*3600*1000);

        var hours=Math.floor(leave1/(3600*1000))+'';

        hours= hours.length==1 ? '0'+hours:hours;

        var leave2=leave1%(3600*1000);

        var minutes=Math.floor(leave2/(60*1000))+'';

        minutes= minutes.length==1 ? '0'+minutes:minutes;

        var leave3=leave2%(60*1000);

        var seconds=(Math.round(leave3/1000))+'';

        seconds= seconds.length==1 ? '0'+seconds:seconds;

        var time = days + "天"+hours+"时"+minutes+"分"+seconds+'秒';

        return time;

    }

    setInterval(function(){

        var end_time = '2020-5-16 17:00:00';

        var nowTime=self.timestampToTime( new Date().getTime());     //2020-04-16 16:21:53

        document.querySelector('#nowTime').innerHTML = nowTime;

        document.querySelector('#end').innerHTML = end_time;

        document.querySelector('#interval').innerHTML = self.timeInterval(end_time,nowTime);

    },1000)

</script>

</body>

</html>

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