<!DOCTYPE html>
<meta charset="utf-8">
<head>
<title></title>
<style type="text/css">
#div1{width: 100px;height: 200px;background-color: red;position: absolute; right: 0;bottom: 0;}
</style>
<script type="text/javascript">
window.onscroll = function()
{
var oDiv1 = document.getElementById('div1');
var scrollTop = document.documentElement.scrollTop||document.body.scrollTop;
startMove(document.documentElement.clientHeight-oDiv1.offsetHeight+scrollTop);
}
var timer = null;
function startMove(iTarget)
{
var oDiv1 = document.getElementById('div1');
clearInterval(timer);
timer = setInterval(function(){
var speed = (iTarget-oDiv.offsetTop)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if (oDiv1.offsetTop==iTarget)
{
clearInterval(timer);
}
else
{
oDiv1.style.top = oDiv1.offsetTop+speed+'px';
}
},30);
}
</script>
</head>
<body style="height: 2000px;">
<div id="div1"></div>
</body>
</html>简若婷