在document加点击事件为什么就不显示了 阻止了冒泡
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>下拉菜单</title>
<style type="text/css">
body,ul,li{ margin:0; padding:0; font-size:13px;}
ul,li{list-style:none;}
#divselect{width:186px; margin:80px auto; position:relative; z-index:10000;}
#divselect cite{width:150px; height:24px;line-height:24px; display:block; color:#807a62; cursor:pointer;font-style:normal;
padding-left:4px; padding-right:30px; border:1px solid #333333;
background:url(xjt.png) no-repeat right center;}
#divselect ul{width:184px;border:1px solid #333333; background-color:#ffffff; position:absolute; z-index:20000; margin-top:-1px; display:none;}
#divselect ul li{height:24px; line-height:24px;}
#divselect ul li a{display:block; height:24px; color:#333333; text-decoration:none; padding-left:10px; padding-right:10px;}
</style>
<script type="text/javascript">
window.onload = function () {
var box = document.getElementById('divselect'),
title = box.getElementsByTagName('cite')[0],
menu = box.getElementsByTagName('ul')[0],
as = box.getElementsByTagName('a'),
index = -1;
// 点击三角时
title.onclick = function (event) {
event = event || window.event;
if (event.stopPropagation) {
event.stopPropagation;
}
else {
event.cancelBubble = true;
} //阻止冒泡事件
menu.style.display = 'block';
// 执行脚本
}
// 滑过滑过、离开、点击每个选项时
// 执行脚本
var oLis = menu.getElementsByTagName('li');
for (i = 0; i < oLis.length; i++) {
oLis[i].onmouseover = function () {
this.style.background = '#567';
}
oLis[i].onmouseout = function () {
this.style.background = '#FFF';
}
oLis[i].onclick = function (event) {
event = event || window.event;
event.stopPropagation ? event.stopPropagation : event.cancelBubble = true;
title.innerHTML = this.innerHTML;
menu.style.display = 'none';
}
}
// 点击页面空白处时
// 执行脚本
document.onclick=function(event){
event=event||window.event;
event.stopPropagatio?event.stopPropagation:event.cancelBubble=true;
menu.style.display='none';
}
}
</script>
</head>
<body>
<div id="divselect">
<cite>请选择分类</cite>
<ul>
<li id="li"><a href="javascript:;" selectid="1">ASP开发</a></li>
<li><a href="javascript:;" selectid="2">.NET开发</a></li>
<li><a href="javascript:;" selectid="3">PHP开发</a></li>
<li><a href="javascript:;" selectid="4">Javascript开发</a></li>
<li><a href="javascript:;" selectid="5">Java特效</a></li>
</ul>
</div>
</body>
</html>
加粗的这一行，如果删掉就能显示Menu 我阻止了冒泡啊 为什么不行呢？
