我要在一个页面放2个悬浮框，悬浮框随页面的上下滚动有上下波动的效果，最终固定在同一位置，求助路过的大神！！
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body {height: 2000px;}
#div1{ width: 100px; height: 150px; background: red; position: absolute;right: 0;bottom: 0; }
#div2{ width: 200px;height: 200px;background:green; position: absolute; left: 0; top: 200px;}
</style>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
<script>
window.onscroll = function() {
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; //滚动的距离
var oDiv = document.getElementById('div1');
oDiv.style.top = (document.documentElement.clientHeight - oDiv.offsetHeight) / 2 + scrollTop + 'px';
startMove("div1", parseInt((document.documentElement.clientHeight - oDiv.offsetHeight) / 2 + scrollTop)); //计算滚动后的offsetTop
var oDiv2 = document.getElementById('div2');
oDiv2.style.top = (document.documentElement.clientHeight - oDiv2.offsetHeight) / 2 + scrollTop + 'px';
startMove("div2", parseInt((document.documentElement.clientHeight - oDiv2.offsetHeight) / 2 + scrollTop));
};
function startMove(obj, target) {
var timer = null;
var oDiv = document.getElementById(obj);
// 实现animate动作
clearInterval(timer);
var iTarget = target;
timer = setInterval(function() {
var speed = (iTarget - oDiv.offsetTop) / 6;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
if ((speed >= 0 && oDiv.offsetTop >= iTarget) || (speed <= 0 && oDiv.offsetTop <= iTarget)) {
clearInterval(timer);
} else {
oDiv.style.top = oDiv.offsetTop + speed + 'px';
}
}, 30);
}
</script></html>
