通过document.getElementById()获取到了ul，然后通过ul.onmouseout设置了alert();
但是只要我的鼠标从ul进入到ul借点内的li中，就alert了。
下面是代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<style type="text/css">
li{
float:left;
/* 注意 li的position必须设置为relative或者absolute */
position:relative;
list-style-type:none;
width:117px;
line-height:33px;
color:blue;
background-color:red;
}
ul{
background-color:yellow;
width:800px;
height:300px;
padding:0px;
margin:0px;
}
</style>
<body>
<ul>
<li><div>协会活动</div></li>
<li><div>基地劳动</div></li>
<li><div>募捐方法</div></li>
<li><div>账目明细</div></li>
</ul>
<script type="text/javascript">
ul = document.getElementsByTagName("ul")[0];
ul.onmouseout = function(e){
e = e || window.event;
if(e.stopPropagation){
e.stopPropagation();
}else{
e.cancelBubble();
}
alert();
}
</script>
</body>
</html>
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