js倒计时动画
#麻辣小龙虾# 人气:0前段时间和朋友去音乐餐厅吃饭，中间有个活动，然后看到他们软件公众号H5有个活动开始的倒计时的动画效果，于是想了下实现思路。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>js实现酷炫倒计时动画效果</title>
<style>
*{margin:0;padding:0;}
body{width:100%;height:100%;overflow:hidden;}
.box{width:1000px;height:700px;margin:100px auto;}
.btn{width:100px;height:100px;margin:50px auto 0;font-size:16px;color:#fff;text-align:center;line-height:100px;border-radius:100px;background:#3385ff;}
.btn:hover{box-shadow: 0 0 10px #77aeff;cursor:pointer;}
h1{font-size:300px;color:red;text-align:center;}
h1.active{animation:count .5s;}
@keyframes count {
from {
transform: scale(.1);
opacity: 1;
}
to {
transform: scale(3.5);
opacity: 0;
display:none;
}
}
</style>
</head>
<body>
<div class="btn">倒计时</div>
<div class="box">
<h1 style="display:none;">10</h1>
</div>
</body>
<script>
let NUMBER = 1;
let COUNT = 10;
let COLORS = ['#8c00ff', '#006bff', '#4fff00', '#ffb800', '#ff0000'];
let timer = null;
function $(str) {
return document.querySelector(str);
}
function actionNum () {
let h1 = $('h1');
$('h1').style.display = 'block';
timer = setInterval(() => {
COUNT--;
NUMBER++;
if (COUNT >= 0) {
h1.classList.remove('active');
setTimeout(() => {
let num = Math.floor(Math.random()*5);
h1.innerText = COUNT;
h1.style.color = COLORS[num];
h1.classList.add('active');
}, 100);
} else {
clearInterval(timer);
}
}, 1000);
}
$('.btn').onclick = function () {
if (COUNT < 0) {
COUNT = 11;
}
actionNum();
};
</script>
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