<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title></title>
<style>
* { padding: 0; margin: 0; }
div { height: 400px; border: 2px solid #000; 600px; margin: 0 auto; overflow: hidden; position: relative; }
ul { position: absolute; top: 0; left: 0; }
li { height: 100px; border: 1px solid red; 600px; list-style: none; }
</style>
</head>
<body>
<div>
<ul>
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
<li>555</li>
<li>666</li>
</ul>
</div>
<script src="https://cdn.bootcss.com/jquery/1.7.2/jquery.min.js"></script>
<script>
(function ($) {
var targetTop = 100;
var targetTimer = 2000;
function scroll() {
var currentTop = Math.abs($("ul").position().top);
var duration = (targetTop - currentTop) * targetTimer / targetTop;
var li = $("ul").find("li:first");
$("ul").animate({ "top": -targetTop }, duration, "linear", function () {
console.log("x")
$("ul").append(li).css("top", 0);
scroll();
});
}
scroll();
$("ul").mouseover(function () {
$(this).stop();
}).mouseout(function () {
scroll();
});
})(jQuery)
</script>
</body>
</html>