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JS implements countdown (days, hours, minutes, seconds)

高洛峰Original: 2016-12-06 15:42:092233browse

The example in this article analyzes the detailed process of implementing countdown in JS for your reference. The specific content is as follows

Note:
parseInt() function can parse a string and return an integer.
Syntax:
parseInt(string, radix)

Example:

parseInt("10"); //返回 10
parseInt("19",10); //返回 19 (10+9)
parseInt("11",2); //返回 3 (2+1)
parseInt("17",8); //返回 15 (8+7)
parseInt("1f",16); //返回 31 (16+15)
parseInt("010"); //未定：返回 10 或 8

Implement countdown code

html code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" >
<title>JS实现倒计时(天数,时,分,秒)</title>
  
</head>
<body onload="leftTimer()">
  
<h2>剩余时间:</h2>
<div id="timer"></div>
</body>
</html>

javascript code:

<script language="javascript" type="text/javascript">
function leftTimer(year,month,day,hour,minute,second){
 var leftTime = (new Date(year,month-1,day,hour,minute,second)) - (new Date()); //计算剩余的毫秒数
 var days = parseInt(leftTime / 1000 / 60 / 60 / 24 , 10); //计算剩余的天数
 var hours = parseInt(leftTime / 1000 / 60 / 60 % 24 , 10); //计算剩余的小时
 var minutes = parseInt(leftTime / 1000 / 60 % 60, 10);//计算剩余的分钟
 var seconds = parseInt(leftTime / 1000 % 60, 10);//计算剩余的秒数
 days = checkTime(days);
 hours = checkTime(hours);
 minutes = checkTime(minutes);
 seconds = checkTime(seconds);
 setInterval("leftTimer(2016,11,11,11,11,11)",1000);
 document.getElementById("timer").innerHTML = days+"天" + hours+"小时" + minutes+"分"+seconds+"秒";
}
function checkTime(i){ //将0-9的数字前面加上0，例1变为01
 if(i<10)
 {
  i = "0" + i;
 }
 return i;
}
  
</script>

Achieved effect:

JS implements countdown (days, hours, minutes, seconds)

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