Introducing javascript to implement timer countdown
Without further ado, let’s get straight to the code.
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title></head><body>
<p>
<span class="hour">1</span>
<span class="minute">2</span>
<span class="second">3</span>
</p>
<script>
var hour = document.querySelector('.hour'); //小时的黑色盒子
var minute = document.querySelector('.minute'); //分钟的黑色盒子
var second = document.querySelector('.second'); //秒数的盒子
var inputTime = +new Date('2021-4-10 23:00:00'); //返回的是用户输入的时间总的毫秒数
// 封装好的计算时间的函数
//先调用一次函数防止开始出现空白
countDown();
//开启定时器
setInterval(countDown,1000);
function countDown() {
var nowTime = +new Date(); //返回的是当前时间的走毫秒数
var times = (inputTime - nowTime) / 1000; //times是剩余时间的总数
// var d = parseInt(times / 60 / 60 / 24); //天
// d = d < 10 ? '0' + d : d;
var h = parseInt(times / 60 / 60 % 24); //时
h = h < 10 ? '0' + h : h;
hour.innerHTML = h; //把剩余的小时给小时黑盒子
var m = parseInt(times / 60 % 60); //当前秒
m = m < 10 ? '0' + m : m;
minute.innerHTML = m;//把剩余的分钟给盒子
var s =parseInt(times%60);//当前秒
s = s < 10 ? '0' + s : s;
second.innerHTML = s;//把剩余的秒数给盒子
// return d + '天' + h + '时' + m + '分' + s + '秒';
}
</script></body></html>A time conversion function is encapsulated here:
function countDown() {
var nowTime = +new Date(); //返回的是当前时间的走毫秒数
var times = (inputTime - nowTime) / 1000; //times是剩余时间的总数
var d = parseInt(times / 60 / 60 / 24); //天
d = d < 10 ? '0' + d : d;
var h = parseInt(times / 60 / 60 % 24); //时
h = h < 10 ? '0' + h : h;
var m = parseInt(times / 60 % 60); //当前秒
m = m < 10 ? '0' + m : m;
var s =parseInt(times%60);//当前秒
s = s < 10 ? '0' + s : s;
return d + '天' + h + '时' + m + '分' + s + '秒';
}Related Free learning recommendations: javascript learning tutorial
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