js让一行页脚始终保持在底部
所谓保持在底部就是: 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；测了一下，还可以，在IE6、IE7、FIREOFX等都没有问题！ 窗口缩小时也没有问题！
CODE:
<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>
您可以试着运行一下代码观看效果：
<!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>www.jb51.net <a href="http://www.jb51.net" target="_blank"><font color=red>脚本</font></a>之家</title>
<style>
*{ margin:0; padding:0}
#info{background:#33CCFF}
#bottom{background:#FFCC00;width:100%;}
</style>
</head>
<body>
<div id="info">
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
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>
