关于div内有子元素时，其鼠标移出事件的触发时机问题急！_html/css_WEB-ITnose

<div style="left:300px;width:150px;border:solid 1px red;" onmouseout="alert('出了层');">    <ul style="border:solid 1px blue;">        <li style="border:solid 1px yellow;">这是ul li1</li>        <li style="border:solid 1px yellow;">这是ul li2</li>    </ul><div>

<script type="text/javascript">       function mOut(e)        {            e = e || window.event;            o = e.relatedTarget||e.toElement;            while(o.parentNode&&o.id!='div1'){            o=o.parentNode;            }            if(o.id!='div1')             {                alert("移出了层");            }        }            $(document).ready(function(){    });    </script>

<div id="div1" style="left:300px;width:150px;height:200px;border:solid 1px red; background-color:Gray;" onmouseout="mOut(event);">    <div style="background-color:Yellow;width:100px;height:100px;"><div style="background-color:Red;width:50px;height:50px;"></div></div></div>