CSS实例:让页脚保持在未满屏页面的底部

　　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" /
titleCSS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"
2br /2br /2br /2br /2br /br /2br /2br /2br /2br /2br /br /2br /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