记录一下，方便后续用。
<!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>Demo</title>
<style>
* {
padding: 0;
margin: 0;
}
#box {
position: relative;
width: 100px;
height: 30px;
overflow: hidden;
}
#box ul {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 400%;
}
#box ul li {
width: 100%;
height: 25%;
font-size: 20px;
}
</style>
</head>
<body>
<div id="box">
<ul>
<li>111</li>
<li>222</li>
<li>333</li>
</ul>
</div>
<script>
const box = document.getElementById('box')
const ulTips = document.getElementsByTagName('ul')[0]
let numTips = 0
let objTips = {
4: ['444', '999'],
5: ['555', '1020'],
29: ['2901', '2902'],
30: ['3001', '3002']
}
ulTips.children[0].innerHTML = objTips[4][0]
ulTips.children[1].innerHTML = objTips[4][1]
ulTips.children[2].innerHTML = objTips[5][0]
const liTipsCopy = ulTips.children[0].cloneNode(true)
ulTips.appendChild(liTipsCopy)
console.log('ulTips: ', ulTips.offsetTop, ulTips.children[0].offsetHeight)
function animate(obj, target, callback) {
clearInterval(obj.timer)
function move() {
var step = (target - obj.offsetTop) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step)
if(obj.offsetTop == target) {
clearInterval(obj.timer);
callback&&callback();
}
obj.style.top = obj.offsetTop + step + 'px'
}
obj.timer = setInterval(move, 40)
}
setInterval(() => {
if(numTips === ulTips.children.length - 1) {
ulTips.style.top = 0
numTips = 0
} else {
numTips++
}
animate(ulTips, -numTips * ulTips.children[0].offsetHeight)
}, 1500)
</script>
</body>
</html>