js控制滚动条缓慢滚动到顶部

来源：互联网发布：测试词汇量网站知乎编辑：程序博客网时间：2024/05/20 03:42

先把下面的代码拷贝到个html中，运行看效果

[html]view plaincopyprint?

<html>
<head>
<scripttype="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>
<styletype="text/css">
</style>
</head>
<body>
<divstyle="height:1000px;text-align:center;font-size:200px;font-weight:bold;">啊</div>
<divstyle="height:1000px;text-align:center;font-size:200px;font-weight:bold;">啊</div>
<divstyle="height:1000px;text-align:center;font-size:200px;font-weight:bold;">啊</div>
<divstyle="height:1000px;text-align:center;font-size:200px;font-weight:bold;">啊</div>
<divstyle="height:1000px;text-align:center;font-size:200px;font-weight:bold;">啊</div>
<divstyle="height:1000px;text-align:center;font-size:200px;font-weight:bold;">啊</div>
<divid="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>

<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。