// qq音乐app观看mv的时候评论推送动画 看到了实现一下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>js 评论列表推送动画系列一</title>
<style>
.box {
width: 400px;
height: 400px;
border: 1px solid #ccc;
margin: 0 auto;
position: relative;
overflow: hidden;
}
ul {
list-style: none;
margin: 0;
padding: 0;
position: absolute;
bottom: 20px;
left: 20px;
}
li {
border-radius: 20px;
line-height: 40px;
border: 1px solid #ccc;
position: absolute;
transition: all 1s;
padding: 0 20px;
margin: 0;
opacity: 0;
bottom: -40px;
opacity: 0;
color: #666;
max-width: 0;
height: 0px;
white-space: nowrap;
}
.active {
max-width: 300px;
height: 40px;
opacity: 1;
animation: fade 2s linear 3s forwards;
}
@keyframes fade{
from {
opacity: 1;
}
to {
opacity: 0;
}
}
</style>
</head>
<body>
<div class="box">
<ul class="list"></ul>
</div>
<script>
var parent = document.getElementsByClassName('list')[0]
var num = 0
var t = setInterval(() => {
num++
var para = document.createElement("li");//获取父节点
para.innerHTML = '醉赤壁好听 +' + num
parent.insertBefore(para, parent.children[0]);//添加至父节点内
var list = document.getElementsByTagName('li')
if (list.length > 6 ) {
parent.removeChild(parent.lastChild)
}
for (let i = 0; i < list.length; i++) {
const element = list[i];
element.style.bottom = (52 * (i - 1)) + 'px'
if (i === 1) {
element.classList.add('active')
}
}
}, 1000)
</script>
</body>
</html>
