<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div {
position: absolute;
left: 0;
100px;
height: 100px;
background-color: pink;
}
</style>
</head>
<body>
<div></div>
<script>
var div = document.querySelector('div');
var timer = setInterval(function() {
if (div.offsetLeft >= 400) {
// 停止动画
clearInterval(timer);
}
div.style.left = div.offsetLeft + 1 + 'px';
}, 30)
</script>
</body>
</html>