JavaScript 倒计时（截止某日期的倒计时和截止每晚12点的倒计时以及固定时间倒计时）

时间：2022-04-11 22:08:12

截止某日期的倒计时和截止每晚12点倒计时：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
</head>
<body>
<h1 id="divTime"></h1>
</body>
<script type="text/javascript">


//距离某日的倒计时
//    var endTime=new Date('2017-9-13');

// 距离今晚24:0:0的倒计时
var endYear=new Date().getFullYear();
var endMonth=new Date().getMonth()+1;
var endDay=new Date().getDate();
var endTime=new Date(endYear,endMonth,endDay);


function leftDiv (){
var Time = endTime-(new Date().getTime());
var Hours = addNumber(Math.floor(Time/1000/60/60%24));
var Minutes = addNumber(Math.floor(Time/1000/60%60));
var Seconds = addNumber(Math.floor(Time/1000%60));

if(Time>0){
            setTimeout(function(){
                leftDiv();
            },1000);
        }else{
            clearTimeout(leftDiv())
        }
        document.getElementById("divTime").innerText="距离截至日期还有"+Hours+"时"+Minutes+"分"+Seconds+"秒";
    }
    leftDiv();

function addNumber(num){
var num=(num>9)?num:('0'+num);
return num;
    }

</script>
</html>

固定时间倒计时：

<!doctype html>
<html>

<head>
<meta charset="utf-8">
<title>jquery版的网页倒计时效果</title>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8" />
<meta content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0,user-scalable=no" name="viewport" id="viewport">
<meta name="format-detection" content="telephone=no" />
<meta content="yes" name="apple-mobile-web-app-capable" />
<meta content="black" name="apple-mobile-web-app-status-bar-style" />
<style type="text/css">
        .time-item strong {
            background: #C71C60;
            color: #fff;
            line-height: 49px;
            font-size: 36px;
            font-family: Arial;
            padding: 0 10px;
            margin-right: 10px;
            border-radius: 5px;
            box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

        #day_show {
            float: left;
            line-height: 49px;
            color: #c71c60;
            font-size: 32px;
            margin: 0 10px;
            font-family: Arial, Helvetica, sans-serif;
}

        .item-title .unit {
            background: none;
            line-height: 49px;
            font-size: 24px;
            padding: 0 10px;
            float: left;
}
</style>
<script type="text/javascript" src="./js/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
var intDiff = parseInt(500000); //倒计时总秒数量

function timer(intDiff) {
            window.setInterval(function() {
var day = 0,
                    hour = 0,
                    minute = 0,
                    second = 0; //时间默认值
if (intDiff > 0) {
                    day = Math.floor(intDiff / (60 * 60 * 24));
                    hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
                    minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
                    second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
                }
if (minute <= 9) minute = '0' + minute;
if (second <= 9) second = '0' + second;
                $('#day_show').html(day + "天");
                $('#hour_show').html('<s id="h"></s>' + hour + '时');
                $('#minute_show').html('<s></s>' + minute + '分');
                $('#second_show').html('<s></s>' + second + '秒');
                intDiff--;
            }, 1000);
        }

        $(function() {
            timer(intDiff);
        });
</script>
</head>

<body>
<div class="time-item">
<span id="day_show">0天</span>
<strong id="hour_show">0时</strong>
<strong id="minute_show">0分</strong>
<strong id="second_show">0秒</strong>
</div>
<!--倒计时模块-->
</body>

</html>

指定日期倒计时：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<span class="timespan"></span>

<script src="./js/jquery-1.8.3.min.js"></script>
<script>
var starttime = new Date("2017/11/20");
    setInterval(function () {
var nowtime = new Date();
var time = starttime - nowtime;
var day = parseInt(time / 1000 / 60 / 60 / 24);
var hour = parseInt(time / 1000 / 60 / 60 % 24);
var minute = parseInt(time / 1000 / 60 % 60);
var seconds = parseInt(time / 1000 % 60);
        $('.timespan').html(day + "天" + hour + "小时" + minute + "分钟" + seconds + "秒");
    }, 1000);
</script>
</body>
</html>

声明：本文所用的jQuery文件引入方式为本地绝对路径引入。要看效果需要自行引入jQuery文件。也可使用jQuery在线链接！

友情赠送jQuery在线链接如下：

jQuery： 
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>

jQuery mobile：
  <link rel="stylesheet"  href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
    <script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
    <script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>

jQuery UI：
  <link rel="stylesheet" href="http://apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
  <script src="http://apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="http://apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
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