<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#div1{ width: 100px; height: 150px; background: red; position: absolute; bottom: 0; right: 0;}
</style>
<script type="text/javascript">
window.onscroll = function(){
var oDiv = document.getElementById('div1');
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
//oDiv.style.top = document.documentElement.clientHeight - oDiv.offsetHeight + scrollTop + 'px';
startMove(parseInt((document.documentElement.clientHeight - oDiv.offsetHeight)/2 + scrollTop))
}
var timer = null;
function startMove(iTarget){
var oDiv = document.getElementById('div1');
clearInterval(timer);
timer = setInterval(function(){
var speed = (iTarget - oDiv.offsetTop)/6;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
if(oDiv.offsetTop == iTarget){
clearInterval(timer);
}else{
oDiv.style.top = oDiv.offsetTop + speed + 'px';
}
},30)
}
</script>
</head>
<body style="height: 2000px;">
<div id="div1"></div>
</body>
</html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#div1{ width: 100px; height: 150px; background: red; position: absolute; bottom: 0; right: 0;}
</style>
<script type="text/javascript">
window.onscroll = function(){
var oDiv = document.getElementById('div1');
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
//oDiv.style.top = document.documentElement.clientHeight - oDiv.offsetHeight + scrollTop + 'px';
startMove(parseInt((document.documentElement.clientHeight - oDiv.offsetHeight)/2 + scrollTop))
}
var timer = null;
function startMove(iTarget){
var oDiv = document.getElementById('div1');
clearInterval(timer);
timer = setInterval(function(){
var speed = (iTarget - oDiv.offsetTop)/6;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
if(oDiv.offsetTop == iTarget){
clearInterval(timer);
}else{
oDiv.style.top = oDiv.offsetTop + speed + 'px';
}
},30)
}
</script>
</head>
<body style="height: 2000px;">
<div id="div1"></div>
</body>
</html>