这篇文章介绍了js 单击式的下拉菜单效果实例，有需要的朋友可以参考一下
复制代码 代码如下:
<!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=gb2312" />
<title>js 单击式的下拉菜单效果</title>
<style>
.div1 { width: 120px; height: 20px; line-height:20px; text-align:center; }
.div2 {width: 120px; position:absolute; left:0; top:10px;visibility:hidden; }
.div2 a{ display:block;}
</style>
</head>
<body>
<script language="JavaScript">
var zindex=100
function dropit2(whichone){
if (window.themenu&&themenu.id!=whichone.id)
themenu.style.visibility="hidden"
themenu=whichone
if (document.all){
themenu.style.left=document.body.scrollLeft+event.clientX-event.offsetX
themenu.style.top=document.body.scrollTop+event.clientY-event.offsetY+18
if (themenu.style.visibility=="hidden"){
themenu.style.visibility="visible"
themenu.style.zIndex=zindex++}
else{
hidemenu()}}}
function dropit(e,whichone){
if (window.themenu&&themenu.id!=eval(whichone).id)
themenu.visibility="hide"
themenu=eval(whichone)
if (themenu.visibility=="hide")
themenu.visibility="show"
else
themenu.visibility="hide"
themenu.zIndex++
themenu.left=e.pageX-e.layerX
themenu.top=e.pageY-e.layerY+19
return false}
function hidemenu(whichone){
if (window.themenu)
themenu.style.visibility="hidden"}
function hidemenu2(){
themenu.visibility="hide"}
if (document.all)
document.onclick=hidemenu
</script>
<span> <a href="###">[点击显示菜单]</a> </span>
<div>
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</div>
</body>
</html> </td>
</tr>
</table>
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