在内容不超过一屏的情况下，当浏览器窗口变小那行页脚文字会跟着向上浮动但还是保持在底部。
当内容多出一屏时，他显示在网页的最下边，而不是窗口的最下边；测试了一下，还可以，在ie6、ie7、ff等都没有问题！窗口缩小时也没有问题！
首先是js脚本：
function test(){
var infoheight = document.getelementbyid("info").scrollheight;
var bottomheight = document.getelementbyid("bottom").scrollheight;
var allheight = document.documentelement.clientheight;
var bottom = document.getelementbyid("bottom");
if((infoheight + bottomheight) < allheight){
bottom.style.position = "absolute";
bottom.style.bottom = "0";
}else{
bottom.style.position = "";
bottom.style.bottom = "";
}
settimeout(function(){test();},10);
}
test();
查看运行效果：
<!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>css实例:让页脚保持在未满屏页面的底部</title>
<style>
*{ margin:0; padding:0}
#info{background:#33ccff}
#bottom{background:#ffcc00;width:100%;}
</style>
</head>
<body>
<div id="info">
2<br />2<br />2<br />2<br />2<br /><br />2<br />2<br />2<br />2<br />2<br /><br />2<br />20000</div>
<div id="bottom">bottom</div>
<script language="javascript" type="text/javascript">
function test(){
var infoheight = document.getelementbyid("info").scrollheight;
var bottomheight = document.getelementbyid("bottom").scrollheight;
var allheight = document.documentelement.clientheight;
var bottom = document.getelementbyid("bottom");
if((infoheight + bottomheight) < allheight){
bottom.style.position = "absolute";
bottom.style.bottom = "0";
}else{
bottom.style.position = "";
bottom.style.bottom = "";
}
settimeout(function(){test();},10);
}
test();
</script>
</body>
</html>
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