1、将Javascript代码和DIV/CSS代码写在同一个文件里：经测试代码如下：@H_301_2@
<!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>让页脚保持在未满屏页面的底部</title>
<!--DIV块的css-->
<style type="text/css">
*{margin:0;padding:0;}
#top{background:#33CCFF;text-align:center;}
#bottom{background:#FFCC00;text-align:center;width:100%;}
</style>
</head>
<body>
<div id="top">top</div>
<div id="bottom">bottom</div>
<!--javascript代码，之所以写在后面，是为了等完全加载top和bottom的DIV块后，便于代码读取相关信息-->
<script language="javascript" type="text/javascript">
function calcDistance(){
var topHeight = document.getElementById("top").scrollHeight;
var bottomHeight = document.getElementById("bottom").scrollHeight;
var allHeight = document.documentElement.clientHeight;
var bottom = document.getElementById("bottom");
if((topHeight + bottomHeight) < allHeight){
bottom.style.position = "absolute";
bottom.style.bottom = "0";
}else{
bottom.style.position = "";
bottom.style.bottom = "";
}
setTimeout(function(){calcDistance();},10);
}
calcDistance();
</script>
</body>
</html>
<!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>让页脚保持在未满屏页面的底部</title>
<link href="index.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" language="javascript" src="index.js"></script>
</head>
<body>
<div id="top">top</div>
<div id="bottom">bottom</div>
<script language="javascript" type="text/javascript">
calcDistance();
</script>
</body>
</html>
@charset "utf-8";
/* CSS Document */
*{
margin:0;
padding:0;
}
#top{
background:#33CCFF;
text-align:center;
}
#bottom{
background:#FFCC00;
text-align:center;
width:100%;
}
// JavaScript Document
function calcDistance(){
var topHeight = document.getElementById("top").scrollHeight;
var bottomHeight = document.getElementById("bottom").scrollHeight;
var allHeight = document.documentElement.clientHeight;
var bottom = document.getElementById("bottom");
if((topHeight + bottomHeight) < allHeight){
bottom.style.position = "absolute";
bottom.style.bottom = "0";//设置距底部距离时如果用数字apx出错,则试试apx
}else{
bottom.style.position = "";
bottom.style.bottom = "";
}
setTimeout(function(){calcDistance();},10);
}
// JavaScript Document
function calcDistance(){
var topHeight = document.getElementById("top").scrollHeight;
var bottomHeight = document.getElementById("bottom").scrollHeight;
var allHeight = document.documentElement.clientHeight;
var bottom = document.getElementById("bottom");
if((topHeight + bottomHeight + 150) < allHeight){
bottom.style.position = "absolute";
bottom.style.bottom = "0";
bottom.style.top = "";
}else{
bottom.style.position = "relative";
bottom.style.bottom = "";
bottom.style.top = "150px";//距离上一个DIV块150像素，如果用150px达不到想要的结果，则试试150（去掉px）
}
setTimeout(function(){calcDistance();},10);
}
