纯JS编写制作的自定义多级右键菜单-JS特效-爱易网页

纯JS编写制作的自定义多级右键菜单

日期：2014-05-18　浏览次数：20339 次

以下是程序代码

<!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>自定义多级右键菜单</title>
<style type="text/css">
html,body{height:100%;overflow:hidden;}
body,div,ul,li{margin:0;padding:0;}
body{font:12px/1.5 \5fae\8f6f\96c5\9ed1;}
ul{list-style-type:none;}
#rightMenu{position:absolute;top:-9999px;left:-9999px;}
#rightMenu ul{float:left;border:1px solid #979797;background:#f1f1f1 url(http://js.fgm.cc/learn/lesson6/img/line.png) 24px 0 repeat-y;padding:2px;box-shadow:2px 2px 2px rgba(0,0,0,.6);}
#rightMenu ul li{float:left;clear:both;height:24px;cursor:pointer;line-height:24px;white-space:nowrap;padding:0 30px;}
#rightMenu ul li.sub{background-repeat:no-repeat;background-position:right 9px;background-image:url(http://js.fgm.cc/learn/lesson6/img/arrow.png);}
#rightMenu ul li.active{background-color:#f1f3f6;border-radius:3px;border:1px solid #aecff7;height:22px;line-height:22px;background-position:right -8px;padding:0 29px;}
#rightMenu ul ul{display:none;position:absolute;}
</style>
<script type="text/javascript">
var getOffset = {
 top: function (obj) {
  return obj.offsetTop + (obj.offsetParent ? arguments.callee(obj.offsetParent) : 0) 
 },
 left: function (obj) {
  return obj.offsetLeft + (obj.offsetParent ? arguments.callee(obj.offsetParent) : 0) 
 } 
};
window.onload = function ()
{
 var oMenu = document.getElementById("rightMenu");
 var aUl = oMenu.getElementsByTagName("ul");
 var aLi = oMenu.getElementsByTagName("li");
 var showTimer = hideTimer = null;
 var i = 0;
 var maxWidth = maxHeight = 0;
 var aDoc = [document.documentElement.offsetWidth, document.documentElement.offsetHeight];
 
 oMenu.style.display = "none";
 
 for (i = 0; i < aLi.length; i++)
 {
  //为含有子菜单的li加上箭头
  aLi[i].getElementsByTagName("ul")[0] && (aLi[i].className = "sub");
  
  //鼠标移入
  aLi[i].onmouseover = function ()
  {
   var oThis = this;
   var oUl = oThis.getElementsByTagName("ul");
   
   //鼠标移入样式
   oThis.className += " active";   
   
   //显示子菜单
   if (oUl[0])
   {
    clearTimeout(hideTimer);    
    showTimer = setTimeout(function ()
    {
     for (i = 0; i < oThis.parentNode.children.length; i++)
     {
      oThis.parentNode.children[i].getElementsByTagName("ul")[0] &&
      (oThis.parentNode.children[i].getElementsByTagName("ul")[0].style.display = "none");
     }
     oUl[0].style.display = "block";
     oUl[0].style.top = oThis.offsetTop + "px";
     oUl[0].style.left = oThis.offsetWidth + "px";
     setWidth(oUl[0]);
     
     //最大显示范围     
     maxWidth = aDoc[0] - oUl[0].offsetWidth;
     maxHeight = aDoc[1] - oUl[0].offsetHeight;
     
     //防止溢出
     maxWidth < getOffset.left(oUl[0]) && (oUl[0].style.left = -oUl[0].clientWidth + "px");
     maxHeight < getOffset.top(oUl[0]) && (oUl[0].style.top = -oUl[0].clientHeight + oThis.offsetTop + oThis.clientHeight + "px")
    },300);
   }   
  };
   
  //鼠标移出 
  aLi[i].onmouseout = function ()
  {
   var oThis = this;
   var oUl = oThis.getElementsByTagName("ul");
   //鼠标移出样式
   oThis.className = oThis.className.replace(/\s?active/,"");
   
   clearTimeout(showTimer);
   hideTimer = setTimeout(function ()
   {
    for (i = 0; i < oThis.parentNode.children.length; i++)
    {
     oThis.parentNode.children[i].getElementsByTagName("ul")[0] &&
     (oThis.pa</div></div>

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