倒计时
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
div{width: 400px; height: 200px; background-color: #00FFFF;}
div span{font-size:20px; float: left; line-height: 200px; margin-left: 100px;}
</style>
</head>
<body onload="leftTimer()">
<div>
<span id="timer"></span>
</div>
<script 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(2019,1,19,8,1,1)",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>
</body>
</html>
