<HEAD>
<title>让footer总是停留在页面的底部</title>
<script language="javascript">
<!--
function moveFooter() {
var iBottom = 0
if (document.all) {
if (parseInt(document.body.scrollHeight) >parseInt(document.body.clientHeight)) {
iBottom = parseInt(document.body.scrollHeight)
}
else iBottom = parseInt(document.body.clientHeight)
document.all["lyfooter"].style.pixelTop = iBottom - parseInt(document.all["lyfooter"].style.height)
document.all["lyfooter"].style.visibility = "visible"
}
else if (document.layers){
if (document.height >self.innerHeight) {
iBottom = document.height
}
else iBottom = self.innerHeight
document.layers["lyfooter"].top = parseInt(iBottom - document.layers["lyfooter"].document.height)
document.layers["lyfooter"].visibility = "visible"
}
else if (document.getElementById) { //NS6
if (document.height >self.innerHeight) {
iBottom = document.height
}
else iBottom = self.innerHeight
document.getElementById("lyfooter").style.top = (parseInt(iBottom - parseInt(document.getElementById("lyfooter").style.height))) + "px"
document.getElementById("lyfooter").style.visibility = "visible"
}
}
//-->
</script>
</HEAD>
<body MS_POSITIONING="GridLayout" onresize="moveFooter()" onload="moveFooter()">
<form id="Form1" method="post">
<!----bottom part--------->
<div id="lyfooter" style="position:absoluteleft:0pxtop:100pxheight:19pxz-index:2visibility:hidden">
<table border="0" width="100%" cellspacing="0" cellpadding="3">
<tr>
<td width="100%" bgColor="#319a63" class="footnote"><font color="#ffffff" size="2px" face="Verdana, Arial, Helvetica, sans-serif">©
2005 ABCDE, Inc.</font></td>
</tr>
</table>
</div>
<!----/bottom part--------->
</form>
</body>
</HTML>
这个不是JS问题，EXTJS的桌面布局，有一个CSS，
overflow : hidden如果你说的是被下面的任务栏遮掉的一部分，那是因为你显示的这个DIV的层级不够高。给需要显示的DIV加上一句CSS试试：
z-index: 10000代码如下：
<html><head>
<meta http-equiv="Content-Type" content="text/html charset=gb2312">
<title>div隐藏与显示</title>
<style type=text/css>
#menus {
background-color: #c4cff0
}
</style>
<script language=javascript>
function Layer_HideOrShow(cur_div)
{ var current=document.getElementById(cur_div)
if(current.style.visibility=="hidden")
{
current.style.visibility ="visible"
}
else
{
current.style.visibility ="hidden"
}
}
</script>
</head>
<body>
<p> </p>
<table border="0" width="153" cellpadding="0" style="border-collapse: collapse" id="table1" height="101">
<tr>
<td>
<a href="#" onclick="Layer_HideOrShow('menus')"><img border="0" src="http://www.shuifutour.com/images/456.gif" width="153" height="25"></a></td>
</tr>
<tr>
<td>
<div id="menus">
<table border="0" width="100%" cellpadding="0" style="border-collapse: collapse" height="150" id="table2">
<tr>
<td> </td>
</tr>
</table>
</div></td>
</tr>
</table>
</body>
</html>
====================
<html>
<head>
<meta http-equiv="Content-Type" content="text/html charset=gb2312" />
<title>无标题文档</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function toggle(targetid){
if (document.getElementById){
target=document.getElementById(targetid)
if (target.style.display=="block"){
target.style.display="none"
} else {
target.style.display="block"
}
}
}
-->
</script>
<style type="text/css">
<!--
#div1{
background-color:#000000
height:400px
width:400px
display:none
}
-->
</style>
</head>
<body>
<input type="button" id="butn" value="显示/隐藏" onclick="toggle('div1')" />
<center>
<div id="div1"></div></center>
居中的DIV
</body>
</html>
=======================
3.javascript 控制 html元素 显示/隐藏
1。编写js函数
<script type="text/javascript">
function display(id){
var traget=document.getElementById(id)
if(traget.style.display=="none"){
traget.style.display=""
}else{
traget.style.display="none"
}
}
</script>
2. 要显示/隐藏的html元素加上 id 属性
<table>
<tr id="menu" >
<td>控制这个tr的显示/隐藏</td>
</tr>
</table>
3，添加按钮，链接等触发 js 函数
<input type="button" onclick="display('menu')" value="显示/隐藏"/>
<a href="#" onclick="display('menu')" >显示/隐藏</a>
javascript显示隐藏层<div id="" style="display:none">广告</div>
<input type="botton" onclick="函数">
<script language=javascript>
function 函数{
if(thisdiv.style.display=='none'){
thisdiv.style.display=""
}
else
thisdiv.style.display="none"
}
</script给div 取个ID=“AA”thisdiv=AA
javascript隐藏/显示表单对象
javascript隐藏/显示表单对象
[SCRIPT language=JavaScript]
function expandIt(el) {
whichEl =document.getElementById(el)
if (whichEl.style.display == 'none') {
whichEl.style.display = ''
}
else {
whichEl.style.display = 'none'
}
}
[/SCRIPT]
el是对象的id，不管是tr或者table等等先设置一下id，然后进行调用。
例：
[a onclick="expandIt('ttchild') return false" href="#" ]try it[/a]
[tr id="ttchild"][td width="18"]Example[/td][/tr]
使用时把[]变成<>
javascript控制页面控件隐藏显示的两种方法
javascript控制页面控件隐藏显示的两种方法，方法的不同之处在于控件隐藏后是否还在页面上占位
方法一：
document.all["PanelSMS"].style.visibility="hidden"
document.all["PanelSMS"].style.visibility="visible"
方法二：
document.all["PanelSMS"].style.display="none"
document.all["PanelSMS"].style.display="inline"
