JS implements countdown function based on user input minutes
No more nonsense, let me just post the code for you. The specific code is as follows:
In fact, I have come across a lot of this countdown before, but I just used other people’s source code.
In response to the needs of the project, I finally took it seriously and took a week to solve a seemingly simple problem.
The source code can be copied and pasted directly.
Redundant version + simplified version.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head> <body>
<script type="text/javascript">
var createTime = '2016-11-14 10:20:00';//开始时间
var limitTimes = 10;//时间长度
// 倒计时 入口
countdowns = window.setInterval(function(){
var arr = cutDoowns(limitTimes,createTime);
document.write(formatDate(arr[0])+':'+formatDate(arr[1])+':'+formatDate(arr[2])+'</br>');
if(arr[2]){
document.write('时间到!');
}
},1000);
/*
s,10分钟后的具体日期：
date,开始时间
然后转化成毫秒比较，所得的差值化成分秒，就是倒计时的分秒。
*/
function cutDoowns(s,date){
console.log('');
var flag = false;
var arr = [];//arr[0]:分，arr[1]:秒，arr[2]:返回boolean
var now = new Date();//当前时间
var now1 = new Date(date);//开始时间
console.log('开始时间 now1: '+now1);
now1.setMinutes(now1.getMinutes()+s);//10分钟后的时间
console.log('当前时间 now ：'+now);
console.log('10分钟时 now1：'+now1);
// 转化成年月日 时分秒 格式
var n = now.getFullYear()+'/'+(now.getMonth()+1)+'/'+now.getDay()+' '+now.getHours()+':'+now.getMinutes()+':'+now.getSeconds();
var n1 = now1.getFullYear()+'/'+(now1.getMonth()+1)+'/'+now1.getDay()+' '+now1.getHours()+':'+now1.getMinutes()+':'+now1.getSeconds();
// 日期转化成毫秒
var time1 = (new Date(n)).getTime();
var time2 = (new Date(n1)).getTime();
// 毫秒转日期格式
var time11 = new Date(time1);
var time21 = new Date(time2);
console.log('当前时间：'+n+'，转化成毫秒：'+time1+'，time11：'+time11);
console.log('10分钟时：'+n1+'，转化成毫秒：'+time2+'，time21：'+time21);
var surplusSec = time2-time1;//距离解锁剩余毫秒
if(surplusSec<=0){
clearInterval(countdowns);
flag = true;
return arr = [00,00,flag];
}
var minute = Math.floor(surplusSec/1000/60);//分钟
var second = Math.floor((surplusSec-minute*60*1000)/1000);//剩余秒数
console.log('剩余时间，minute: '+minute+'，second: '+second+'，surplusSec:'+surplusSec);
// var second = Math.round(surplusTimes);//秒数
console.log('剩余时间，minute: '+minute+'，second: '+second+'，surplusSec:'+surplusSec);
arr = [minute,second,flag];
return arr;
}
//格式化日期：把单字符转成双字符
function formatDate(n){
n = n.toString();
// console.log(n);
if(n.length<=1){
n = '0'+n;
}
// console.log(n);
return n;
}
</script>
</body>
</html>Simplified version:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>打开调试工具，看效果！</title>
</head>
<body>
<script type="text/javascript">
/*
打开调试工具，看效果！
思路：
1.设置一个倒计时的时间长度；
2.设置开始时间和当前时间；
3.结束时间是 开始时间+倒计时间；
4.结束毫秒-开始毫秒=剩余倒计时间。
*/
// 准备
var countdownMinute = 10;//10分钟倒计时
var startTimes = new Date('2016-11-16 15:55');//开始时间 new Date('2016-11-16 15:21');
var endTimes = new Date(startTimes.setMinutes(startTimes.getMinutes()+countdownMinute));//结束时间
var curTimes = new Date();//当前时间
var surplusTimes = endTimes.getTime()/1000 - curTimes.getTime()/1000;//结束毫秒-开始毫秒=剩余倒计时间
// 进入倒计时
countdowns = window.setInterval(function(){
surplusTimes--;
var minu = Math.floor(surplusTimes/60);
var secd = Math.round(surplusTimes%60);
console.log(minu+':'+secd);
if(surplusTimes<=0){
console.log('时间到！');
clearInterval(countdowns);
}
},1000);
</script>
</body>
</html>
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