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<div id="y1">左上角位置的内容</div>
<div id="y2">右上角位置的内容</div>
<div id="y3">左下角位置的内容</div>
<div id="y4">右下角位置的内容</div>
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<p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p>
<p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p>
<p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p><p>a</p>
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>测试</title>
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var o=document.getElementById("bottomnav");
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<body>
<div id="bottomnav" style="position:fixed; bottom:0;right:0;height:20px;width:70px;"><a href="javascript:window.scrollTo(0,0);">返回顶部</a></div>
<div style="width:200px;height:1500px;border:1px solid #bfbfbf;"></div>
</body>
</body>
</html>
<!--[if IE 6]>
<script type="text/javascript">
function gotop()
{
var o=document.getElementById("bottomnav");
o.style.position='absolute';//变更其定位方式
//获取顶离偏移量
var top= document.documentElement?(document.documentElement.scrollTop || 0):(document.body.scrollTop || 0);
top = Math.max(top, (window.scrollY || 0));
top+= document.documentElement?(document.documentElement.clientHeight || 0):(document.body.clientHeight || 0);
//获取左边偏移量
var left= document.documentElement?(document.documentElement.clientWidth || 0):(document.body.clientWidth || 0);
//设置
o.style.left=left-70+'px';
o.style.top=top-20+'px';
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window.attachEvent?window.attachEvent("onscroll",gotop):window.addEventListener("scroll",gotop,false);
</script>
<![endif]-->
<div id="bottomnav" style="position:fixed; bottom:0;right:0;height:20px;width:70px;"><a href="javascript:window.scrollTo(0,0);">返回顶部</a></div>