在內容不超過一屏的情況下，當浏覽器窗口變小那行頁腳文字會跟著向上浮動但還是保持在底部。
當內容多出一屏時，他顯示在網頁的最下邊，而不是窗口的最下邊；測試了一下，還可以，在IE6、IE7、FF等都沒有問題！窗口縮小時也沒有問題！
首先是JS腳本：
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();
查看運行效果：
<!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實例:讓頁腳保持在未滿屏頁面的底部</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>