js控制滚动条缓慢滚动到顶部实现代码
作者：
滚动条缓慢滚动到顶部这样的效果想必大家在浏览网页的时候都有见过吧，本文使用js实现下，感兴趣的你可不要错过了哈，希望可以帮助到你
先把下面的代码拷贝到个html中，运行看效果
<html>
<head>
<script type="text/javascript">
var currentPosition,timer;
function GoTop(){
timer=setInterval("runToTop()",1);
}
function runToTop(){
currentPosition=document.documentElement.scrollTop || document.body.scrollTop;
currentPosition-=10;
if(currentPosition>0)
{
window.scrollTo(0,currentPosition);
}
else
{
window.scrollTo(0,0);
clearInterval(timer);
}
}
</script>
<style type="text/css">
</style>
</head>
<body>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">饭</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">吃</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">家</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">回</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">你</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">带</div>
<div id="back-up" onclick="GoTop()" style="border:1px solid red;height:100px;width:15px;position:fixed;cursor:pointer;right:10px;bottom:30px;">返回顶部</div>
<script>
window.scrollTo(0,document.body.scrollHeight);
</script>
</body>
</html>
速度可以自己控制哦。
复制代码 代码如下:
<html>
<head>
<script type="text/javascript">
var currentPosition,timer;
function GoTop(){
timer=setInterval("runToTop()",1);
}
function runToTop(){
currentPosition=document.documentElement.scrollTop || document.body.scrollTop;
currentPosition-=10;
if(currentPosition>0)
{
window.scrollTo(0,currentPosition);
}
else
{
window.scrollTo(0,0);
clearInterval(timer);
}
}
</script>
<style type="text/css">
</style>
</head>
<body>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">饭</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">吃</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">家</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">回</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">你</div>
<div style="height:1000px;text-align:center;font-size:200px;font-weight:bold;">带</div>
<div id="back-up" onclick="GoTop()" style="border:1px solid red;height:100px;width:15px;position:fixed;cursor:pointer;right:10px;bottom:30px;">返回顶部</div>
<script>
window.scrollTo(0,document.body.scrollHeight);
</script>
</body>
</html>
速度可以自己控制哦。