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js 单击式的下拉菜单效果实例

2013-08-13 00:00 776 查看

<!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 class="div1" onClick="dropit2(dropmenu);event.cancelBubble=true;return false"> <a href="###" onClick="if(document.layers) return dropit(event, 'document.dropmenu')">[点击显示菜单]</a> </span> 
<div class="div2" id="dropmenu"> 
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</div> 
</body> 
</html> </td>
   </tr>
 </table>

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