<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script language="javascript">
function gotoTop(){
window.scrollTo(0,0);
}
</script>
</head>
<body id="top">
sdfssdfsdf<br><br><br><br><br><br><br>sdfsdf<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>sdfsdf
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>sdadasdasd
<br><br><br><br><br><br><br><br>asdasdasd
<br><br><br><br>
<a href="#" οnclick="gotoTop();">Top</a>
<a href="#top" target="_self">Top</a>
<input type="button" οnclick="location.replace('#top')"
value="Top"/>
</body>
</html>
1. <a href="#" οnclick="gotoTop();">Top</a> 调用js方法控制滚动条回到顶端
2.
<a href="#top" target="_self">Top</a> 使用锚标记(body中id="top")
3.
<input type="button" οnclick="location.replace('#top')" value="Top"/> 和2原理一样,只不过是超链接换成了用button来实现