结构就类似这样:<ul>
<li>node</li>
<ul>
<li>node</li>
<li>node</li>
<li>node</li>
<li>node</li>
</ul>
<li>node</li>
<ul>
<li>node</li>
<li>node</li>
<li>node</li>
<li>node</li>
<ul>
<li>node</li>
<li>node</li>
<li>node</li>
<li>node</li>
</ul>
</ul>
</ul>
<li>node</li>
<ul>
<li>node</li>
<li>node</li>
<li>node</li>
<li>node</li>
</ul>
<li>node</li>
<ul>
<li>node</li>
<li>node</li>
<li>node</li>
<li>node</li>
<ul>
<li>node</li>
<li>node</li>
<li>node</li>
<li>node</li>
</ul>
</ul>
</ul>
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<head>
<title>标题页</title>
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IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;
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if (ver4) {
with (document) {
write("<STYLE TYPE='text/css'>");
if (NS4) {
write(".parent {position:absolute; visibility:visible}");
write(".child {position:absolute; visibility:visible}");
write(".regular {position:absolute; visibility:visible}")
}
else {
write(".child {display:none}")
}
write("</STYLE>");
}
}
//当菜单打开时,页面上菜单以下的东西的位置顺序往下推,菜单合起时,菜单以下的东西自动上移。
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nextY = document.layers[firstInd].pageY +document.layers[firstInd].document.height;
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whichele = document.layers[i];
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whichele.pageY = nextY;
nextY += whichele.document.height;
}
}
}
//初始化菜单
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if (!ver4) return;
if (NS4) {
for (i=0; i<document.layers.length; i++) {
whichele = document.layers[i];
if (whichele.id.indexOf("Child") != -1) whichele.visibility = "hide";
}
arrange();
}
else {
divColl = document.all.tags("DIV");
for (i=0; i<divColl.length; i++) {
whichele = divColl(i);
if (whichele.className == "child") whichele.style.display = "none";
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}
}
//展开菜单的方法
function expandIt(ele) {
if (!ver4) return;
if (IE4) {
whichele = eval(ele + "Child");
if (whichele.style.display == "none") {
whichele.style.display = "block";
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whichele.style.display = "none";
}
}
else {
whichele = eval("document." + ele + "Child");
if (whichele.visibility == "hide") {
whichele.visibility = "show";
}
else {
whichele.visibility = "hide";
}
arrange();
}
}
onload = initIt;
</script>
</head>
<body>
<div id="menuParent" class="parent"> <a href="#" onClick="expandIt('menu'); return false" >父菜单一</a></div>
<div id="menuChild" class="child"> <a href="#" target="_blank" >子菜单一</a><br>
<a href="#" target="_blank" >子菜单二</a><br>
<a href="#" target="_blank" >子菜单三</a></div>
<div id="Menu2Parent" class="parent"> <a href="#" onClick="expandIt('Menu2'); return false" >父菜单二</a></div>
<div id="Menu2Child" class="child"> <a href="#" target="_blank" >子菜单一</a><br>
<a href="#" target="_blank" >子菜单二</a><br>
<a href="#" target="_blank" >子菜单三</a></div>
<div id="Menu3Parent" class="parent"> <a href="#" onClick="expandIt('Menu3'); return false" >父菜单三</a></div>
<div id="Menu3Child" class="child"> <a href="#" target="_blank" >子菜单一</a><br>
<a href="#" target="_blank" >子菜单二</a><br>
<a href="#" target="_blank" >子菜单三</a></div>
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