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一個簡單的仿XP的JS下拉菜單
一個簡單的仿xp的js下拉菜單,本來想用在我的網站的后臺管理,但后來發(fā)現(xiàn)不實用,還是采用了左右框架的樹型菜單,但這個程序既然寫出來了,貼出來,希望對其它人有用,有興趣的朋友可以對快捷鍵功能進行擴展,目前留有接口,但未實現(xiàn)。

menu.htm(菜單主文件)
<html>
 <head>
  <title>Noteless Valley(lijun.org)程序示例</title>
  <meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
  <meta name="vs_targetSchema" content="  <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
  <link href="xp_menu.css" rel="stylesheet" type="text/css">
  <script language="javascript" src="xp_menu.js"></script>
  <script language="javascript" for="document" event="onselectstart">
<!--
 return document_onselectstart()
//-->
  </script>
  <script language="javascript" for="document" event="onclick">
<!--
 return document_onclick()
//-->
  </script>
 </head>
 <body scroll="no" language="javascript" onresize="return window_onresize()" onload="return window_onload()">
  <script language="javascript">
<!--
 //定義一個主菜單對象
 var mnuMain = new menu("mnuMain");    
 mnuMain.bar[0] = new menu_bar("mnuMainNL","","無名谷","","Noteless Valley","",0,"mnuNL");
 mnuMain.bar[1] = new menu_bar("mnuMainSiteAdmin","","網站管理","","網站管理","",0,"mnuSiteAdmin");
 mnuMain.bar[2] = new menu_bar("mnuMainSystem","","系統(tǒng)管理","","系統(tǒng)管理","",0,"mnuSystem");
 mnuMain.bar[3] = new menu_bar("mnuMainShow","","演示菜單","","Menu Show","",0,"mnuShow");
 popMainMenu(mnuMain,0,0,"100%",27);    //激活主菜單,通過參數(shù)確定主菜單的位置
 
 var mnuNL = new menu("mnuNL");
 mnuNL.bar[0] = new menu_bar("mnuHomePage","","首頁","","HomePage","",1,"
 mnuNL.bar[1] = new menu_bar("mnuDesign","","網頁設計","","Design","",1," mnuNL.bar[2] = new menu_bar("mnuProgram","","網絡編程","","Program","",1," mnuNL.bar[3] = new menu_bar("mnuOthers","","其它文章","","Others","",1," popSubMenu(mnuNL);
 
 var mnuSiteAdmin = new menu("mnuSiteAdmin")
 mnuSiteAdmin.bar[0] = new menu_bar("mnuAddressUpdate","","訪問地區(qū)更新","","訪問地區(qū)更新","",1,"AddressUpdate.asp");
 popSubMenu(mnuSiteAdmin);
 
 var mnuSystem = new menu("mnuSystem");
 mnuSystem.bar[0] = new menu_bar("mnuSysUser","","用戶管理","","用戶管理","",1,"userAdmin.asp");
 mnuSystem.bar[1] = new menu_bar("mnuSysAuthority","","權限管理","","權限管理","",1,"authority.asp");
 mnuSystem.bar[2] = new menu_bar("\-","","","","","","","");
 mnuSystem.bar[3] = new menu_bar("mnuSysPwdChange","","口令修改","","口令修改","",1,"chgpwd.asp");
 mnuSystem.bar[4] = new menu_bar("\-","","","","","","","");
 mnuSystem.bar[5] = new menu_bar("mnuSysHelp","","幫助","","幫助","",1,"help.asp");
 mnuSystem.bar[6] = new menu_bar("mnuSysAbout","","關于本系統(tǒng)","","關于本系統(tǒng)","",1,"about.asp");
 mnuSystem.bar[7] = new menu_bar("\-","","","","","","","");
 mnuSystem.bar[8] = new menu_bar("mnuSysExit","","退出系統(tǒng)","","退出本系統(tǒng)","",1,"quit.asp");
 popSubMenu(mnuSystem);
 
 var mnuShow = new menu("mnuShow");
 mnuShow.bar[0] = new menu_bar("mnuShow1","","演示菜單一","","Menu Show 1","",1,"menushow1.asp");
 mnuShow.bar[1] = new menu_bar("mnuShow2","","演示菜單二","","Menu Show 2","",0,"mnuShow_2");
 mnuShow.bar[2] = new menu_bar("mnuShow3","","演示菜單三","","Menu Show 3","",1,"menushow3.asp");
 mnuShow.bar[3] = new menu_bar("\-","","","","","","","");
 mnuShow.bar[4] = new menu_bar("mnuShow4","","演示菜單四","","Menu Show 4","",1,"menushow4.asp");
 mnuShow.bar[5] = new menu_bar("mnuShow5","","演示菜單五","","Menu Show 5","",0,"mnuShow_2");
 popSubMenu(mnuShow);
 
 var mnuShow_2 = new menu("mnuShow_2");
 mnuShow_2.bar[0] = new menu_bar("mnuShow21","","演示菜單二一","","Menu Show 2.1","",1,"menushow21.asp");
 mnuShow_2.bar[1] = new menu_bar("mnuShow22","","演示菜單二二","","Menu Show 2.2","",0,"mnuShow_22");
 mnuShow_2.bar[2] = new menu_bar("mnuShow23","","演示菜單二三","","Menu Show 2.3","",1,"menushow23.asp");
 mnuShow_2.bar[3] = new menu_bar("mnuShow24","","演示菜單二四","","Menu Show 2.4","",0,"mnuShow_22");
 mnuShow_2.bar[4] = new menu_bar("mnuShow25","","演示菜單二五","","Menu Show 2.5","",1,"menushow25.asp");
 popSubMenu(mnuShow_2);
 
 var mnuShow_22 = new menu("mnuShow_22");
 mnuShow_22.bar[0] = new menu_bar("mnuShow221","","演示菜單二二一","","Menu Show 2.2.1","",1,"menushow221.asp");
 mnuShow_22.bar[1] = new menu_bar("mnuShow222","","演示菜單二二二","","Menu Show 2.2.2","",1,"menushow222.asp");
 mnuShow_22.bar[2] = new menu_bar("mnuShow223","","演示菜單二二三","","Menu Show 2.2.3","",1,"menushow223.asp");
 popSubMenu(mnuShow_22);
//-->
  </script>
  <table border=0 cellpadding=0 cellspacing=0><tr><td height=27>此部分已經被頂部菜單條覆蓋</td></tr></table>
  <p id=lblOutput>信息提示區(qū)域</p>
 </body>
</html>

xp_menu.css(樣式表)
body {
 FONT-SIZE: 13px;
 MARGIN: 0px;
 SCROLLBAR-SHADOW-COLOR: silver;
 SCROLLBAR-3DLIGHT-COLOR: silver;
 LINE-HEIGHT: 20px;
 FONT-FAMILY: Verdana, 宋體;
 SCROLLBAR-DARKSHADOW-COLOR: silver;
 BACKGROUND-COLOR: #ff99cc;
 border: none;
}

DIV.MainMenuBG
{
 border-right: teal 1px solid;
 font-size: 14px;
 border-left: #ffffff 1px solid;
 cursor: default;
 color: #000000;
 border-bottom: teal 1px solid;
 font-family: Verdana, 宋體;
 position: absolute;
 background-color: #d6d3ce;
}
DIV.MainMenu
{
 border-right: #d6d3ce 1px solid;
 padding-right: 8px;
 border-top: #d6d3ce 1px solid;
 padding-left: 8px;
 padding-bottom: 1px;
 border-left: #d6d3ce 1px solid;
 cursor: default;
 padding-top: 1px;
 border-bottom: #d6d3ce 1px solid;
 position: absolute;
 background-color: #d6d3ce;
}
DIV.MainMenuOver
{
 border-right: #08246b 1px solid;
 padding-right: 8px;
 border-top: #08246b 1px solid;
 padding-left: 8px;
 padding-bottom: 1px;
 border-left: #08246b 1px solid;
 cursor: default;
 padding-top: 1px;
 border-bottom: #08246b 1px solid;
 position: absolute;
 background-color: #b5bed6;
}
DIV.MainMenuClick
{
 border-right: #636563 1px solid;
 padding-right: 8px;
 border-top: #636563 1px solid;
 padding-left: 8px;
 padding-bottom: 1px;
 border-left: #636563 1px solid;
 cursor: default;
 padding-top: 1px;
 border-bottom: #636563 1px solid;
 position: absolute;
 background-color: #dedbd6;
}
DIV.SubMenuBG
{
 border-right: #636563 1px solid;
 border-top: #636563 1px solid;
 font-size: 14px;
 visibility: hidden;
 border-left: #636563 1px solid;
 color: #000000;
 border-bottom: #636563 1px solid;
 font-family: Verdana, 宋體;
 position: absolute;
 background-color: #fffbf7;
}
DIV.SubMenu
{
 cursor: default;
 position: absolute;
}
DIV.SubMenuOver
{
 cursor: default;
 position: absolute;
}
TD.ico
{
 border-top: #dedbd6 1px solid;
 border-left: #dedbd6 1px solid;
 border-bottom: #dedbd6 1px solid;
 background-color: #dedbd6;
}
TD.icoOver
{
 border-top: #08246b 1px solid;
 border-left: #08246b 1px solid;
 border-bottom: #08246b 1px solid;
 background-color: #b5bed6;
 border-right-width: 1px;
 border-right-color: #08246b;
}
TD.text
{
 padding-right: 2px;
 border-top: #fffbf7 1px solid;
 padding-left: 5px;
 border-bottom: #fffbf7 1px solid;
 background-color: #fffbf7;
}
TD.textOver
{
 padding-right: 2px;
 border-top: #08246b 1px solid;
 padding-left: 5px;
 border-bottom: #08246b 1px solid;
 background-color: #b5bed6;
}
TD.skey
{
 padding-right: 2px;
 border-top: #fffbf7 1px solid;
 padding-left: 2px;
 border-bottom: #fffbf7 1px solid;
 background-color: #fffbf7;
}
TD.skeyOver
{
 padding-right: 2px;
 border-top: #08246b 1px solid;
 padding-left: 2px;
 border-bottom: #08246b 1px solid;
 background-color: #b5bed6;
}
TD.sub
{
 border-right: #fffbf7 1px solid;
 border-top: #fffbf7 1px solid;
 border-bottom: #fffbf7 1px solid;
 background-color: #fffbf7;
}
TD.subOver
{
 border-right: #08246b 1px solid;
 border-top: #08246b 1px solid;
 border-bottom: #08246b 1px solid;
 background-color: #b5bed6;
}
DIV.SubMenu TD
{
 font-size: 14px;
 padding-top: 2px;
}

xp_menu.js(.js包含文件)
<!--
// menu source code

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//    以下為建立菜單的部分
//_______________________________________

 //菜單條的結構
 function menu_bar(name,ico,text,key,tip,skey,type,cmd) {
  this.name = name;     //名稱
  this.ico = ico;      //圖標
  this.text = text;     //文字
  this.key = key;      //熱鍵
  this.tip = tip;      //提示
  this.skey = skey;     //快捷鍵
  this.type = type;     //命令類型,0為彈出下級菜單,1為執(zhí)行一個命令(跳轉到另一個文件)
  this.cmd = cmd;      //下級菜單的名稱或命令字符串,根據(jù)type的值而定
 }
 
 //菜單的結構
 function menu(name) {
  this.name = name;      //名稱
  this.bar = new Array();   //所包含的菜單條數(shù)組
 }
 
 //輸出一已定義的主菜單,橫排的
 function popMainMenu(menu,left,top,width,height) {
  
  var strHTML, posLeft, posTop, i;
  
  strHTML = "<div id=‘" + menu.name + "‘ style=‘left:" + left + ";top:" + top + ";width:" + width + ";height:" + height + "‘ class=‘MainMenuBG‘>"
  document.write (strHTML);
  
  posLeft = 2;
  posTop = 1;
  for (i=0;i<menu.bar.length;i++) {
   strHTML = "<div id=‘" + menu.bar[i].name + "‘ nowrap style=‘left:" + posLeft + ";top:" + posTop + ";‘ class=‘MainMenu‘ " +
        "onmouseover=‘return menu_onmouseover(this,\"" + menu.bar[i].cmd + "\")‘ onmouseout=‘return menu_onmouseout(this)‘ " +
        "onclick=‘return menu_onclick(this,\"" + menu.bar[i].cmd + "\")‘ title=‘" + menu.bar[i].tip + "‘>" + menu.bar[i].text;
   if (menu.bar[i].key!="") {
    strHTML += "(<u>" + menu.bar[i].key + "</u>)";
   }
   strHTML += "</div>";
   document.write (strHTML);
   posLeft += document.all.item(menu.bar[i].name).offsetWidth + 1;
  }
  
  strHTML = "</div>";
  document.write (strHTML);
 }
 
 //輸出一個已定義的子菜單,豎排的
 function popSubMenu(menu) {
  
  var strHTML, posLeft, posTop, i;
  
  strHTML = "<div id=‘" + menu.name + "‘ style=‘left:20;top:30;width:244;height:300;‘ class=‘SubMenuBG‘>"
  document.write (strHTML);
  
  posLeft = 1;
  posTop = 1;
  
  for (i=0;i<menu.bar.length;i++) {
   if (menu.bar[i].name!="\-") {    //如果名稱不是“\-”,表示是一個普通菜單條
    strHTML = "<div id=‘" + menu.bar[i].name + "‘ style=‘left:" + posLeft + ";top:" + posTop + ";‘ class=‘SubMenu‘ " +
         "title=‘" + menu.bar[i].tip + "‘ " +
         "onmouseover=‘return bar_onmouseover(this," + menu.bar[i].type + ",\"" + menu.bar[i].cmd + "\")‘ " +
         "onmouseout=‘return bar_onmouseout(this," + menu.bar[i].type + ",\"" + menu.bar[i].cmd + "\")‘ " +
         "onclick=‘return bar_onclick(this," + menu.bar[i].type + ",\"" + menu.bar[i].cmd + "\")‘>" +
         "  <table border=0 cellspacing=0 cellpadding=0 width=240>" +
         "    <tr>" +
         "      <td nowrap align=center width=20 id=‘" + menu.bar[i].name + "_ico‘ class=‘ico‘>";
    if (menu.bar[i].ico!="") {
     strHTML += "<img border=0 width=16 height=16 src=‘" + menu.bar[i].ico + "‘>";
    }else {
     strHTML += " ";
    }
    strHTML += "</td>" +
         "      <td nowrap id=‘" + menu.bar[i].name + "_text‘ class=‘text‘>" + menu.bar[i].text;
    if (menu.bar[i].key!="") { strHTML = strHTML + "(<u>" + menu.bar[i].key + "</u>)"; }
    strHTML += "</td>" +
         "<td nowrap align=right id=‘" + menu.bar[i].name + "_skey‘ class=‘skey‘>";
    if (menu.bar[i].skey!="") {
     strHTML += menu.bar[i].skey;
    }else {
     strHTML += " ";
    }
    strHTML += "     </td>" +
         "      <td nowrap align=center width=20 id=‘" + menu.bar[i].name + "_sub‘ class=‘sub‘>";
    if (menu.bar[i].type==0) {
     strHTML += "→";
    }else {
     strHTML += "  ";
    }
    strHTML += "</td>" +
         "    </tr>" +
         "  </table>" +
         "</div>";
    document.write (strHTML);
    posTop += document.all.item(menu.bar[i].name).offsetHeight;
   }else {       //如果名稱是“\-”,表示是一條分隔線
    strHTML = "<div style=‘left:" + posLeft + ";top:" + posTop + ";‘ class=‘SubMenu‘>" +
         "  <table border=0 cellpadding=0 cellspacing=0 width=240>" +
         "    <tr>" +
         "      <td nowrap style=‘background-color: #dedbd6;‘ width=21></td>" +
         "      <td nowrap style=‘padding-left:5px;padding-top:1px;padding-bottom:1px;‘>" +
         "        <table border=0 cellpadding=0 cellspacing=0 width=100%>" +
         "          <tr><td height=1 bgcolor=‘#636563‘></td></tr>" +
         "        </table>" +
         "      </td>" +
         "    </tr>" +
         "  </table>" +
         "</div>";
    document.write (strHTML);
    posTop += 3;
   }
  }
  
  strHTML = "</div>"
  document.write (strHTML);
  document.all.item(menu.name).style.height = posTop+3;    //重設子菜單背景框
 }


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//    以下為操縱菜單的部分
//_________________________________________________

 function showMenu(menu,submenu) {  //顯示一級子菜單
  document.all.item(submenu).style.left = menu.parentElement.offsetLeft + menu.offsetLeft + 1;   //設置子菜單位置
  document.all.item(submenu).style.top = menu.parentElement.offsetTop + menu.offsetTop + menu.offsetHeight -1;   //設置子菜單的位置
  document.all.item(submenu).style.visibility = "visible";   //顯示子菜單
  mnuPrev[mnuPrev.length] = new menuinfo(submenu,1);   //將新打開的子菜單的ID加入當前顯示菜單ID數(shù)組
 }
 
 function showSubMenu(menu,submenu) {  //顯示二級及以下子菜單
  document.all.item(submenu).style.left = menu.parentElement.offsetLeft + menu.offsetLeft + menu.offsetWidth + 2;   //設置子菜單位置
  document.all.item(submenu).style.top = menu.parentElement.offsetTop + menu.offsetTop + 1;   //設置子菜單的位置
  if (document.all.item(submenu).offsetLeft + document.all.item(submenu).offsetWidth > doc_width) {
   document.all.item(submenu).style.left = menu.parentElement.offsetLeft - document.all.item(submenu).offsetWidth + 1;
  }
  if (document.all.item(submenu).offsetTop + document.all.item(submenu).offsetHeight > doc_height) {
   document.all.item(submenu).style.top = document.all.item(submenu).offsetTop + menu.offsetHeight - document.all.item(submenu).offsetHeight + 2;
  }
  document.all.item(submenu).style.visibility = "visible";   //顯示子菜單
  mnuPrev[mnuPrev.length] = new menuinfo(submenu,1);   //將新打開的子菜單的ID加入當前顯示菜單ID數(shù)組
 }
 
 function showstatus() {   //測試階段用的函數(shù),顯示當前菜單ID數(shù)組內的內容
  lblMsg.innerText = "";
  for(var i=0;i<mnuPrev.length;i++) {
   lblMsg.innerText += mnuPrev[i].id + " > ";
  }
 }
 
 function menuinfo(id,type) {
  this.id = id;    //0表示菜單項,1表示菜單框
  this.type = type;
 }

 function menu_onmouseover(obj,cmd) {
  if(!mClick) {
   obj.className = "MainMenuOver";
   mnuPrev[mnuPrev.length] = new menuinfo(obj.id,0);    //將當前的菜單ID壓入當前菜單ID數(shù)組
   //showstatus();   //調試階段使用
  }else {
   if (mnuPrev[0].id == obj.id) { return false; }   //如果是在本身上移動,不作為
   document.all.item(mnuPrev[0].id).className = "MainMenu";
   for (var i=1;i<mnuPrev.length;i++) {
    if (mnuPrev[i].type==0) {   //如果是菜單項,設置成默認樣式
     document.all.item(mnuPrev[i].id + "_ico").className = "ico";
     document.all.item(mnuPrev[i].id + "_text").className = "text";
     document.all.item(mnuPrev[i].id + "_skey").className = "skey";
     document.all.item(mnuPrev[i].id + "_sub").className = "sub";
    }else {   //如果是菜單框,隱藏它
     document.all.item(mnuPrev[i].id).style.visibility = "hidden";
    }
   }
   mnuPrev.length = 0;
   obj.className = "MainMenuClick";
   mnuPrev[mnuPrev.length] = new menuinfo(obj.id,0);
   showMenu(obj,cmd);
   //showstatus();   //調試階段使用
  }
 }

 function menu_onmouseout(obj) {
  if(!mClick) {
   obj.className = "MainMenu";
   mnuPrev.length --;   //清除最后一個壓入當前菜單ID數(shù)組的菜單ID
   //showstatus();   //調試階段使用
  }
 }
 
 function menu_onclick(obj,cmd) {
  if(!mClick) {    //如果菜單當前狀態(tài)是非點擊狀態(tài),證明當前是從非點擊狀態(tài)到點擊狀態(tài)
   obj.className = "MainMenuClick";    //設置當前菜單為鼠標單擊之后的狀態(tài)
   showMenu(obj,cmd);    //顯示子菜單
   //showstatus();   //調試階段使用
   mClick = true;   //設置菜單當前是點擊狀態(tài)
  }else {
   obj.className = "MainMenuOver";    //設置當前菜單為鼠標移動上面的狀態(tài),非點擊狀態(tài)
   document.all.item(mnuPrev[mnuPrev.length-1].id).style.visibility = "hidden";
   mnuPrev.length --;
   //showstatus();   //調試階段使用
   mClick = false;    //主菜單當前是非點擊狀態(tài)
  }
  bMenuClick = true;   //在一個菜單上單擊后設置其狀態(tài)為true,用來屏蔽document_click事件
 }

 function bar_onmouseover(obj,type,cmd) {
  for (var i=1;i<mnuPrev.length;i++) {
   if(mnuPrev[i].id==obj.parentElement.id) {
    for (var j=i+1;j<mnuPrev.length;j++) {    //處理由前一個菜單項打開的子菜單,可能有多層
     if (mnuPrev[j].type==0) {   //如果是菜單項,設置成默認樣式
      document.all.item(mnuPrev[j].id + "_ico").className = "ico";
      document.all.item(mnuPrev[j].id + "_text").className = "text";
      document.all.item(mnuPrev[j].id + "_skey").className = "skey";
      document.all.item(mnuPrev[j].id + "_sub").className = "sub";
     }else {   //如果是菜單框,隱藏它
      document.all.item(mnuPrev[j].id).style.visibility = "hidden";
     }
    }
    mnuPrev.length = i + 1;
    break;
   }
  }
  mnuPrev[mnuPrev.length] = new menuinfo(obj.id,0);
  //showstatus();   //調試階段使用
  document.all.item(obj.id + "_ico").className = "icoOver";
  document.all.item(obj.id + "_text").className = "textOver";
  document.all.item(obj.id + "_skey").className = "skeyOver";
  document.all.item(obj.id + "_sub").className = "subOver";
  if (type==0) { showSubMenu(obj,cmd); }   //如果有下一級菜單就展開
  //showstatus();   //調試階段使用
 }
  
 function bar_onmouseout(obj,type,cmd) {
  if (type!=0) {
   document.all.item(obj.id + "_ico").className = "ico";
   document.all.item(obj.id + "_text").className = "text";
   document.all.item(obj.id + "_skey").className = "skey";
   document.all.item(obj.id + "_sub").className = "sub";
   if (mnuPrev.length>0) {
    mnuPrev.length --;
   }
   
   //showstatus();   //調試階段使用
  }
 }

 function bar_onclick(obj,type,cmd) {
  if (type==1) {
   //window.navigate(cmd);   //跳轉到相應的文件
   lblOutput.innerText = cmd; //演示期間,將文件名顯示出來
  }else {
   bMenuClick = true;   //在一個菜單上單擊后設置其狀態(tài)為true,用來屏蔽document_click事件
  }
 }


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//    以下為與主文件有關的控制部分,具體使用時需要關注的也僅僅這部分而已
//_____________________________________________________________

 var doc_width;    //當前窗口的寬度,隨窗口大小改變而改變
 var doc_height;    //當前窗口的高度,隨窗口大小改變而改變
 
 var mClick = false;   //一級菜單是否被點擊,初始一級菜單是未被點擊狀態(tài)
 var bMenuClick = false;    //單擊是否是在一個菜單上,初始單擊不是在一個菜單上
 var mnuPrev = new Array();   //當前顯示的菜單ID數(shù)組,初始為空

 function document_onselectstart() {
  return false;    //屏蔽內容選擇功能
 }

 function document_onclick() {
  if(!bMenuClick) {
   if (mnuPrev.length>0) {
    for (var i=1;i<mnuPrev.length;i++) {
     if (mnuPrev[i].type==0) {   //如果是菜單項,設置成默認樣式
      document.all.item(mnuPrev[i].id + "_ico").className = "ico";
      document.all.item(mnuPrev[i].id + "_text").className = "text";
      document.all.item(mnuPrev[i].id + "_skey").className = "skey";
      document.all.item(mnuPrev[i].id + "_sub").className = "sub";
     }else {   //如果是菜單框,隱藏它
      document.all.item(mnuPrev[i].id).style.visibility = "hidden";
     }
    }
    document.all.item(mnuPrev[0].id).className = "MainMenu";    //將主菜單的狀態(tài)恢復普通狀態(tài)
   }
   mnuPrev.length = 0;    //清空當前顯示菜單
   mClick = false;    //清除菜單點擊狀態(tài)
  }else {
   bMenuClick = false;
  }
 }

 function window_onresize() {
  //當窗口尺寸變化時改變相應變量的值
  doc_height = window.document.body.offsetHeight;
  doc_width = window.document.body.offsetWidth;
 }

 function window_onload() {
  //初始化窗口尺寸
  doc_height = window.document.body.offsetHeight;
  doc_width = window.document.body.offsetWidth;
 }

//-->


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