标签：start fixed isp scrollto name div log input 控制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>滑动侧边栏</title>
<style>
* {
margin: 0;
padding: 0;
}
#div1 {
width: 100px;
height: 100px;
position: absolute;
right: 0;
background: red;
}
</style>
<script>
window.onscroll = function() {
var oDiv = document.getElementById(‘div1‘);
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
//oDiv.style.top = scrollTop + (document.documentElement.clientHeight - oDiv.offsetHeight) / 2 + ‘px‘;
var t = (scrollTop + (document.documentElement.clientHeight - oDiv.offsetHeight) / 2);
startMove(parseInt(t));//有分数，为了防止出现小数，则取整
}
var timer = null;
function startMove(iTarget) {
var oDiv = document.getElementById(‘div1‘);
clearInterval(timer);
timer = setInterval(function() {
var iSpeed = (iTarget - oDiv.offsetTop) / 8;//用速度变量控制移动的快慢
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);//小于0向上取整，大于0向下取整
if (oDiv.offsetTop == iTarget) {
clearInterval(timer);
} else {
oDiv.style.top = oDiv.offsetTop + iSpeed + ‘px‘;
}
txt1.value = oDiv.offsetTop;
}, 30)
}
</script>
</head>
<body style="height:100000px;">
<div id="div1"></div>
<input type="text" name="" value="" id="txt1" style="position:fixed">
</body>
</html>
标签：start fixed isp scrollto name div log input 控制
原文地址：http://www.cnblogs.com/Mr-W/p/6404806.html
