Ctrl+/
IE11
F11
ESC
PgUp
PgDn
<!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=utf-8" />
<title>返回顶部按钮</title>
<!--[if lt IE 7]>
<style type="text/css">
#gotopbtn{position:absolute;top:expression(eval(document.documentElement.scrollTop + 350));}
</style>
<![endif]-->
body{
font:12px Verdana, Geneva, sans-serif;
line-height:1.2;
text-align:center;
CSS代码...
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JS代码...