js控制滚动条缓慢滚动到顶部实现代码
先把下面的代码拷贝到个html中，运行看效果 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。