倒计时
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div {
200px;
height: 200px;
background-color: pink;
margin: 100px auto;
float: left;
padding: 20px;
font-size: 90px;
}
</style>
</head>
<body>
<div class = "hour"></div>
<div class="minite"></div>
<div class="second"></div>
<script>
var hour = document.querySelector('.hour');
var minite = document.querySelector('.minite');
var second = document.querySelector('.second');
var inputTime = +new Date('2019-5-1 18:00:00'); //返回的是用户输入事件总的毫秒数
countDown();//我们先调用一次这个函数 防止第一次 刷新页面有空白
setInterval(countDown,1000);
function countDown() {
var nowTime = +new Date();//返回的是当前时间总的毫秒数
var times = (inputTime - nowTime)/1000; //times是剩余时间的总秒数
var h = parseInt(times / 60 /60 % 24); //时
h = h < 10 ? '0' + h : h;
hour.innerHTML = h;//把剩余的小时数 给小时黑色盒子
var m = parseInt(times / 60 % 60); //分
m = m < 10 ? '0' + m : m;
minite.innerHTML = m;
var s = parseInt(times % 60); //当前的秒
s = s < 10 ? '0' + s : s;
second.innerHTML = s;
}
</script>
</body>
</html>