html文档结构如下：
<body>
<div>
<a href="3" class="meauLink" id="meau1">comedies</a>
<ul class="meau" id="meau2">
<li><a href="page1.html">All is Well That Ends Well1</a></li>
<li><a href="page1.html">All is Well That Ends Well2</a></li>
<li><a href="page1.html">All is Well That Ends Well3</a></li>
<li><a href="page1.html">All is Well That Ends Well4</a></li>
</ul>
</div>
JS代码：
function toggleMeau1()
{
var link = document.getElementById("meau1");
var link1 = document.getElementById("meau2").style;
link.onmouseover = function()
{
link1.display = "block";
} //鼠标移动到链接上自动打开菜单
link.parentNode.onmouseout = function()
{
link1.display = "none";
}//鼠标移出层后自动关闭菜单
}
问题来了
鼠标离开链接后自动关闭了菜单，而我的原先设想是鼠标离开层后再自动关闭菜单。用css设置ul的display状态为none。鼠标移动到链接上打开的菜单难道就不算div的吗（这是本问题的重点，希望大神们详细解答下）？为了对比， 我又试了将代码改成进入层自动打开菜单，离开层关闭菜单，能达到鼠标离开层自动关闭菜单的效果。
用计时器延时执行隐藏操作，如果移动到菜单上就清楚掉计时器
你这种效果用css就能完毕，不需要用js，麻烦
<div>
<a href="3" class="meauLink" id="meau1">comedies</a>
<ul class="meau" id="meau2">
<li><a href="page1.html">All is Well That Ends Well1</a></li>
<li><a href="page1.html">All is Well That Ends Well2</a></li>
<li><a href="page1.html">All is Well That Ends Well3</a></li>
<li><a href="page1.html">All is Well That Ends Well4</a></li>
</ul>
</div>
<script>
function toggleMeau1() {
var link = document.getElementById("meau1");
var link1 = document.getElementById("meau2");
link1.onmouseover = function () {
clearTimeout(timer);
}
link1.onmouseout = function (e) {
e = e || window.event;
var o = e.relatedTarget || e.toElement;
do {
if (o == this) return;//移动到子元素
}
while (o = o.parentNode)
this.style.display='none'
}
link.onmouseover = function () {
link1.style.display = "block";
} //鼠标移动到链接上自动打开菜单
var timer
link.onmouseout = function (e) {
e = e || window.event;
var o = e.relatedTarget || e.toElement;
do {
if (o == this) return;//移动到子元素
}
while (o = o.parentNode)
timer = setTimeout(function () {
link1.style.display = "none";
}, 500);
}//鼠标移出层后自动关闭菜单
}
toggleMeau1()
</script>