代码简介：
鼠标划过快速展开的JS下拉菜单，缺点是代码偏多，建议封装在一个文件里。
代码内容:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>鼠标划过快速展开的JS下拉菜单_网页代码站(www.webdm.cn)</title>
</head>
<body>
<SCRIPT language=jscript>
var mmenus = new Array();
var misShow = new Boolean();
misShow=false;
var misdown = new Boolean();
misdown=false;
var msrcel;
var mfromel;
var mtoel;
var musestatus=false;
var mthestatus="";
var mpopTimer = 0;
mmenucolor='Menu';mfontcolor='MenuText';mmenuoutcolor='#000084';mmenuincolor='#000084';mmenuoutbordercolor='#FFFFFF';mmenuinbordercolor='#00000
0';mmidoutcolor='#E2DFDA';mmidincolor='#8D8A85';mmenuovercolor='#FFFFFF';mitemedge='0';msubedge='0';mmenuunitwidth=60;mmenuitemwidth=160;mmenuh
eight=30;mmenuwidth='100%';mmenuadjust=0;mmenuadjustV=0;mfonts='font-family: 宋体; font-size: 9pt; color: MenuText; ';mcursor='default';
var swipeSteps = 4;
var swipemsec = 25;
var swipeArray = new Array();
function swipe(el, dir, steps, msec) {
if (steps == null) steps = swipeSteps;
if (msec == null) msec = swipemsec;
if (el.swipeIndex == null)
el.swipeIndex = swipeArray.length;
if (el.swipeTimer != null)
window.clearTimeout(el.swipeTimer);
swipeArray[el.swipeIndex] = el;
el.style.clip = "rect(-99999, 99999, 99999, -99999)";
if (el.swipeCounter == null) {
el.orgLeft = el.offsetLeft;
el.orgTop = el.offsetTop;
el.orgWidth = el.offsetWidth;
el.orgHeight = el.offsetHeight;
}
else if (el.swipeCounter == 0) {
el.orgLeft = el.offsetLeft;
el.orgTop = el.offsetTop;
el.orgWidth = el.offsetWidth;
el.orgHeight = el.offsetHeight;
}
el.style.left = el.orgLeft;
el.style.top = el.orgTop;
el.swipeCounter = steps;
el.style.clip = "rect(0,0,0,0)";
window.setTimeout("repeat(" + dir + "," + el.swipeIndex + "," + steps + "," + msec + ")", msec);
}
function repeat(dir, index, steps, msec) {
el = swipeArray[index];
var left = el.orgLeft;
var top = el.orgTop;
var width = el.orgWidth;
var height = el.orgHeight;
if (el.swipeCounter == 0) {
el.style.clip = "rect(-99999, 99999, 99999, -99999)";
return;
}
else {
el.swipeCounter--;
el.style.visibility = "visible";
switch (dir) {
case 2:
el.style.clip = "rect(" + height*el.swipeCounter/steps + "," + width + "," + height + "," + 0 + ")";
el.style.top = top - height*el.swipeCounter/steps;
break;
case 8:
el.style.clip = "rect(" + 0 + "," + width + "," + height*(steps-el.swipeCounter)/steps + "," + 0 + ")";
el.style.top = top + height*el.swipeCounter/steps;
break;
case 6:
el.style.clip = "rect(" + 0 + "," + width + "," + height + "," + width*(el.swipeCounter)/steps + ")";
el.style.left = left - width*el.swipeCounter/steps;
break;
case 4:
el.style.clip = "rect(" + 0 + "," + width*(swipeSteps - el.swipeCounter)/steps + "," + height + "," + 0 + ")";
el.style.left = left + width*el.swipeCounter/steps;
break;
}
el.swipeTimer = window.setTimeout("repeat(" + dir + "," + index + "," + steps + "," + msec + ")", msec);
}
}
function hideSwipe(el) {
window.clearTimeout(el.swipeTimer);
el.style.visibility = "hidden";
el.style.clip = "rect(-99999, 99999, 99999, -99999)";
el.swipeCounter = 0;
}
function stoperror(){
return true;
}
window.onerror=stoperror;
function mpopOut() {
mpopTimer = setTimeout('mallhide()', 500);
}
function getReal(el, type, value) {
temp = el;
while ((temp != null) && (temp.tagName != "BODY")) {
if (eval("temp." + type) == value) {
el = temp;
return el;
}
temp = temp.parentElement;
}
return el;
}
function mMenuRegister(menu)
{
mmenus[mmenus.length] = menu
return (mmenus.length - 1)
}
function mMenuItem(caption,command,target,isline,statustxt,img,sizex,sizey,pos){
this.caption=caption;
this.command=command;
this.target=target;
this.isline=isline;
this.statustxt=statustxt;
this.img=img;
this.sizex=sizex;
this.sizey=sizey;
this.pos=pos;
}
function mMenu(caption,command,target,img,sizex,sizey,pos){
this.items = new Array();
this.caption=caption;
this.command=command;
this.target=target;
this.img=img;
this.sizex=sizex;
this.sizey=sizey;
this.pos=pos;
this.id=mMenuRegister(this);
}
function mMenuAddItem(item)
{
this.items[this.items.length] = item
item.parent = this.id;
this.children=true;
}
mMenu.prototype.addItem = mMenuAddItem;
function mtoout(src){
src.style.borderLeftColor=mmenuoutbordercolor;
src.style.borderRightColor=mmenuinbordercolor;
src.style.borderTopColor=mmenuoutbordercolor;
src.style.borderBottomColor=mmenuinbordercolor;
src.style.backgroundColor=mmenuoutcolor;
src.style.color=mmenuovercolor;
}
function mtoin(src){
src.style.borderLeftColor=mmenuinbordercolor;
src.style.borderRightColor=mmenuoutbordercolor;
src.style.borderTopColor=mmenuinbordercolor;
src.style.borderBottomColor=mmenuoutbordercolor;
src.style.backgroundColor=mmenuincolor;
src.style.color=mmenuovercolor;
}
function mnochange(src){
src.style.borderLeftColor=mmenucolor;
src.style.borderRightColor=mmenucolor;
src.style.borderTopColor=mmenucolor;
src.style.borderBottomColor=mmenucolor;
src.style.backgroundColor='';
src.style.color=mfontcolor;
}
function mallhide(){
for(var nummenu=0;nummenu<mmenus.length;nummenu++){
var themenu=document.all['mMenu'+nummenu]
var themenudiv=document.all['mmenudiv'+nummenu]
mnochange(themenu);
mmenuhide(themenudiv);
}
}
function mmenuhide(menuid){
hideSwipe(menuid);
misShow=false;
}
function mmenushow(menuid,pid){
menuid.style.left=mposflag.offsetLeft+pid.offsetLeft+mmenuadjust;menuid.style.top=mposflag.offsetTop+mmenutable.offsetHeight+mmenuadjustV;
swipe(menuid,2,4);
if(mmenuitemwidth+parseInt(menuid.style.left)>document.body.clientWidth)
menuid.style.left=document.body.clientWidth-mmenuitemwidth;
misShow=true;
}
function mmenu_over(menuid,x){
mtoel = getReal(window.event.toElement, "className", "coolButton");
mfromel = getReal(window.event.fromElement, "className", "coolButton");
if (mtoel == mfromel) return;
msrcel = window.event.srcElement;
if(x<0){
misShow = false;
mallhide();
mtoout(msrcel);
}else{
mallhide();
mtoin(msrcel);
mmenushow(menuid,eval("mMenu"+x));
}
clearTimeout(mpopTimer);
}
function mmenu_out(menuid){
mtoel = getReal(window.event.toElement, "className", "coolButton");
mfromel = getReal(window.event.fromElement, "className", "coolButton");
if (mtoel == mfromel) return;
msrcel = window.event.srcElement;
if (misShow){
mtoin(msrcel);
}else{
mnochange(msrcel);
}
mpopOut()
}
function mmenu_down(menuid,x){
msrcel = getReal(window.event.srcElement, "className", "coolButton");
if(misShow){
mmenuhide(menuid);
mtoout(msrcel);
}
else{
mtoin(msrcel);
mmenushow(menuid,eval("mMenu"+x));
misdown=true;
}
}
function mmenu_up(){
misdown=false;
}
function mmenuitem_over(menuid){
msrcel = getReal(window.event.srcElement, "className", "coolButton");
if(misdown){
mtoin(msrcel);
}
else{
mtoout(msrcel);
}
if(mthestatus!=""){
musestatus=true;
window.status=mthestatus;
}
clearTimeout(mpopTimer);
}
function mmenuitem_out(menuid){
msrcel = getReal(window.event.srcElement, "className", "coolButton");
mnochange(msrcel);
if(musestatus)window.status="";
mpopOut()
}
function mmenuitem_down(menuid){
msrcel = getReal(window.event.srcElement, "className", "coolButton");
mtoin(msrcel)
misdown=true;
}
function mmenuitem_up(menuid){
msrcel = getReal(window.event.srcElement, "className", "coolButton");
mtoout(msrcel)
misdown=false;
}
function mexec2(x){
var cmd;
if(mmenus[x].target=="blank"){
cmd = "window.open('"+mmenus[x].command+"')";
}else{
cmd = mmenus[x].target+".location='"+mmenus[x].command+"'";
}
eval(cmd);
}
function mexec(x,i){
var cmd;
if(mmenus[x].items[i].target=="blank"){
cmd = "window.open('"+mmenus[x].items[i].command+"')";
}else{
cmd = mmenus[x].items[i].target+".location='"+mmenus[x].items[i].command+"'";
}
eval(cmd);
}
function mbody_click(){
if (misShow){
msrcel = getReal(window.event.srcElement, "className", "coolButton");
for(var x=0;x<=mmenus.length;x++){
if(msrcel.id=="mMenu"+x)
return;
}
mallhide();
}
}
document.onclick=mbody_click;
var mMenuBodyRef;
function mwritetodocument(){
var mwb=1;
for(var i in document.all){
if (document.all[i].tagName == 'BODY'){
mMenuBodyRef = document.all[i]
var stringx='<div id="mposflag" style="position:absolute;"></div><table id=mmenutable border=0 cellpadding=0
cellspacing=2 width='+mmenuwidth+' height='+mmenuheight+' bgcolor='+mmenucolor+
' onselectstart="event.returnValue=false"'+
' style="cursor:'+mcursor+';'+mfonts+
' border-left: '+mwb+'px solid '+mmenuoutbordercolor+';'+
' border-right: '+mwb+'px solid '+mmenuinbordercolor+'; '+
'border-top: '+mwb+'px solid '+mmenuoutbordercolor+'; '+
'border-bottom: '+mwb+'px solid '+mmenuinbordercolor+'; padding:0px"><tr>'
for(var x=0;x<mmenus.length;x++){
var thismenu=mmenus[x];
var imgsize;
if(thismenu.sizex=="0"&&thismenu.sizey=="0"){
imgsize="";
}else{
imgsize=" width="+thismenu.sizex+" height="+thismenu.sizey;
}
var ifspace;
if(thismenu.caption==""){
ifspace="";
}else{
ifspace=" ";
}
stringx += "<td class=coolButton id=mMenu"+x+" style='border: "+mitemedge+"px solid "+mmenucolor+
"' width="+mmenuunitwidth+"px onmouseover=mmenu_over(mmenudiv"+x+
","+x+") onmouseout=mmenu_out(mmenudiv"+x+
") onmousedown=mmenu_down(mmenudiv"+x+","+x+")";
if(thismenu.command!=""){
stringx += " onmouseup=mexec2("+x+");mmenu_up();";
}else{
stringx += " onmouseup=mmenu_up()";
}
if(thismenu.pos=="0"){
stringx += " align=center><img align=absmiddle src="+thismenu.img+imgsize+">"+ifspace+thismenu.caption
+"</td>";
}else if(thismenu.pos=="1"){
stringx += " align=center>"+thismenu.caption+ifspace+"<img align=absmiddle src="+thismenu.img+imgsize
+"></td>";
}else if(thismenu.pos=="2"){
stringx += " align=center background="+thismenu.img+">"+thismenu.caption+"</td>";
}else{
stringx += " align=center>"+thismenu.caption+"</td>";
}
stringx += "";
}
stringx+="<td width=*> </td></tr></table>";
for(var x=0;x<mmenus.length;x++){
thismenu=mmenus[x];
if(x<0){
stringx+='<div id=mmenudiv'+x+' style="visiable:none"></div>';
}else{
stringx+='<div id=mmenudiv'+x+
' style="cursor:'+mcursor+';position:absolute;'+
''+mmenuitemwidth+'px; z-index:'+(x+100);
if(mmenuinbordercolor!=mmenuoutbordercolor&&msubedge=="0"){
stringx+=';border-left: 1px solid '+mmidoutcolor+
';border-top: 1px solid '+mmidoutcolor;}
stringx+=';border-right: 1px solid '+mmenuinbordercolor+
';border-bottom: 1px solid '+mmenuinbordercolor+';visibility:hidden" onselectstart="event.returnValue=false">\n'+
'<table width="100%" border="0" height="100%" align="center" cellpadding="0" cellspacing="2" '+
'style="'+mfonts+' border-left: 1px solid '+mmenuoutbordercolor;
if(mmenuinbordercolor!=mmenuoutbordercolor&&msubedge=="0"){
stringx+=';border-right: 1px solid '+mmidincolor+
';border-bottom: 1px solid '+mmidincolor;}
stringx+=';border-top: 1px solid '+mmenuoutbordercolor+
';padding: 4px" bgcolor='+mmenucolor+'>\n'
for(var i=0;i<thismenu.items.length;i++){
var thismenuitem=thismenu.items[i];
var imgsize;
if(thismenuitem.sizex=="0"&&thismenuitem.sizey=="0"){
imgsize=""
}else{
imgsize=" width="+thismenuitem.sizex+" height="+thismenuitem.sizey
}
var ifspace;
if(thismenu.caption==""){
ifspace="";
}else{
ifspace=" ";
}
if(!thismenuitem.isline){
stringx += "<tr><td class=coolButton style='border: "+mitemedge+"px solid "+mmenucolor+
"' width=100% height=15px onmouseover=\"mthestatus='"+thismenuitem.statustxt+"';mmenuitem_over(mmenudiv"+x+
");\" onmouseout=mmenuitem_out(mmenudiv"+x+
") onmousedown=mmenuitem_down(mmenudiv"+x+") onmouseup=";
stringx += "mexec("+x+","+i+");mmenuitem_up(mmenudiv"+x+") ";
if(thismenuitem.pos=="0"){
stringx += "><img align=absmiddle src="+thismenuitem.img+imgsize+">"+ifspace+thismenuitem.caption
+"</td></tr>";
}else if(thismenuitem.pos=="1"){
stringx += ">"+thismenuitem.caption+ifspace+"<img align=absmiddle src="+thismenuitem.img+imgsize
+"></td></tr>";
}else if(thismenuitem.pos=="2"){
stringx += "background="+thismenuitem.img+">"+thismenuitem.caption+"</td></tr>";
}else{
stringx += ">"+thismenuitem.caption+"</td></tr>";
}
}else{
stringx+='<tr><td height="1" background="hr.gif"><img border="0" src="none.gif" width="1"
height="1"></td></tr>\n';
}
}stringx+='</table>\n</div>'
}
}
document.write("<div align='left'>"+stringx+"</div>");
break
}
}
}
function document_load(){
mwritetodocument();
}mpmenu1=new mMenu('文件','','self','','','','');
mpmenu1.addItem(new mMenuItem('新建','javascript:alert("新建")','self',false,'新建','','','',''));
mpmenu1.addItem(new mMenuItem('打开','javascript:alert("打开")','self',false,'打开','','','',''));
mpmenu1.addItem(new mMenuItem('保存','javascript:alert("保存")','self',false,'保存','','','',''));
mpmenu1.addItem(new mMenuItem(null,null,null,true));
mpmenu1.addItem(new mMenuItem('退出','javascript:alert("退出")','self',false,'退出','','','',''));
mpmenu2=new mMenu('编辑','','self','','','','');
mpmenu2.addItem(new mMenuItem('撤销','javascript:alert("撤销")','self',false,'撤销','','','',''));
mpmenu2.addItem(new mMenuItem('重做','javascript:alert("重做")','self',false,'重做','','','',''));
mpmenu2.addItem(new mMenuItem(null,null,null,true));
mpmenu2.addItem(new mMenuItem('拷贝','javascript:alert("拷贝")','self',false,'拷贝','','','',''));
mpmenu2.addItem(new mMenuItem('粘贴','javascript:alert("粘贴")','self',false,'粘贴','','','',''));
mpmenu3=new mMenu('收藏','','self','','','','');
mpmenu3.addItem(new mMenuItem('我的主页','http://www.webdm.cn','blank',false,'访问我的主页','','','',''));
mpmenu3.addItem(new mMenuItem('Yahoo','http://www.web5.cc','blank',false,'访问Yahoo','','','',''));
mpmenu4=new mMenu('帮助','','self','','','','');
mpmenu4.addItem(new mMenuItem('内容','javascript:alert("内容")','self',false,'内容','','','',''));
mpmenu4.addItem(new mMenuItem('给我写email','mailto:admin@webdm.cn','self',false,'给我写email','','','',''));
mpmenu4.addItem(new mMenuItem(null,null,null,true));
mpmenu4.addItem(new mMenuItem('关于','javascript:alert("关于")','self',false,'关于这个软件','','','',''));
</SCRIPT>
<SCRIPT>document_load()</SCRIPT>
</body>
</html>
<br>
<p><a href="http://www.webdm.cn">网页代码站</a> - 最专业的代码下载网站 - 致力为中国站长提供有质量的代码！</p>
代码来自：http://www.webdm.cn/webcode/46ea9af1-4f98-4d67-aad7-43265c0bae01.html