【js效果】倒计时
节日倒计时
方法一
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>倒计时</title>
<style>
*{
margin: 0;
padding:0;
}
p {
font-size: 80px;
text-align: center;
}
p span {
color: red;
}
p span.time {
color: black
}
body{padding-top:200px;}
</style>
</head>
<body>
<p>距离2021年还有</p>
<p><span></span></p>
<script>
var oSpan = document.getElementsByTagName('span')[0];
function tow(n) {
return n >= 0 && n < 10 ? '0' + n : '' + n;
}
function getDate() {
var oDate = new Date();//获取日期对象
var oldTime = oDate.getTime();//现在距离1970年的毫秒数
var newDate = new Date('2021/1/28 00:00:00');
var newTime = newDate.getTime();//2021年距离1970年的毫秒数
var second = Math.floor((newTime - oldTime) / 1000);//未来时间距离现在的秒数
var day = Math.floor(second / 86400);//整数部分代表的是天；一天有24*60*60=86400秒 ；
second = second % 86400;//余数代表剩下的秒数；
var hour = Math.floor(second / 3600);//整数部分代表小时；
second %= 3600; //余数代表 剩下的秒数；
var minute = Math.floor(second / 60);
second %= 60;
var str = tow(day) + '<span class="time">天</span>'
+ tow(hour) + '<span class="time">小时</span>'
+ tow(minute) + '<span class="time">分钟</span>'
+ tow(second) + '<span class="time">秒</span>';
console.log( tow(day))
if(tow(day) > 1){
oSpan.innerHTML = str;
}
else if(tow(day) == 1){
oSpan.innerHTML = '只有2天啦！'
}
else if(tow(day) == 0){
oSpan.innerHTML = '只有1天啦！'
}
else{
oSpan.innerHTML = '已经过了'
}
// oSpan.innerHTML = str;
}
getDate();
setInterval(getDate, 1000);
</script>
</body>
</html>
方法二
参考：https://www.lanrenzhijia.com/others/10131.html
<div class="timecounter">
<span id="t_d"></span>
<span id="t_h"></span>
<span id="t_m"></span>
<span id="t_s"></span>
</div>
<script type="text/javascript">
function getRTime() {
var EndTime = new Date("2020/01/01 00:00:00"); //截止时间
var NowTime = new Date();
var t = EndTime.getTime() - NowTime.getTime();
var d = Math.floor(t / 1000 / 60 / 60 / 24);
var h = Math.floor(t / 1000 / 60 / 60 % 24);
var m = Math.floor(t / 1000 / 60 % 60);
var s = Math.floor(t / 1000 % 60);
document.getElementById("t_d").innerHTML = d + " 天";
document.getElementById("t_h").innerHTML = h + " 时";
document.getElementById("t_m").innerHTML = m + " 分";
document.getElementById("t_s").innerHTML = s + " 秒";
}
setInterval(getRTime, 1000);
</script>
60s倒计时
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>60s倒计时</title>
</head>
<body>
<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" />
<script type="text/javascript">
var countdown = 60;
function settime(val) {
if (countdown == 0) {
val.removeAttribute("disabled");
val.value = "免费获取验证码";
countdown = 60;
} else {
val.setAttribute("disabled", true);
val.value = "重新发送(" + countdown + ")";
countdown--;
}
setTimeout(function () {
settime(val)
}, 1000)
}
</script>
</body>
</html>
30分钟倒计时
说明：倒计时结束后，重新出现倒计时的按钮，点击按钮，可以重新进行倒计时。
html：
js:
// 倒计时
var djsBtn = document.querySelector(".djsBtn");
djsBtn.onclick = function () {
var djsTxt = document.querySelector('.djsTxt');
var time = 1800; //30分钟换算成1800秒
// 补位
function buwei(n) {
return n >= 0 && n < 10 ? '0' + n : '' + n;
}
var daojishi = setInterval(function () {
djsBtn.style.display = 'none';
djsTxt.style.display = 'block';
time = time - 1;
var minute = parseInt(time / 60);
var second = parseInt(time % 60);
djsTxt.innerHTML = buwei(minute) + ':' + buwei(second);
if (minute == 0 && second == 0) {
djsBtn.style.display = 'block';
djsTxt.style.display = 'none';
clearInterval(daojishi);
}
}, 1000);
}
