日期:2014-05-16 浏览次数:20619 次
<!DOCTYPE HTML>
<html>
<head>
<title>soul42</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" >
<STYLE type="text/css">
    * { margin:0;  padding:0;}
    #box{width:30px;margin:200px auto 0 ;display:block;position:relative}
    ul{position:absolute;top:-202px;left:0;width:200px;}
    li{height:20px;background:orange;margin-bottom:1px}
</STYLE>
</head>
<body>
    <div id="box">sd
        <ul style="display:none" id="list">
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
        </ul>
    </div>
    <script type="text/javascript">
        var $ = function(id){return document.getElementById(id)}
        $("box").onmouseover = function(){
            $("list").style.display = "block";
        }
        $("box").onmouseout = function(){
            $("list").style.display = "none";
        }
    </script>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<title>soul42</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" >
<STYLE type="text/css">
    * { margin:0;  padding:0;}
    #box{width:30px;margin:200px auto 0 ;display:block;position:relative;}
    ul{position:absolute;top:-202px;left:0;width:200px;}
    li{height:20px;background:orange;margin-bottom:1px}
</STYLE>
</head>
<body>
    <div id="box">sd
        <ul style="display:none" id="list">
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
            <li>23</li>
        </ul>
    </div>
    <script type="text/javascript">
        var tid = null;
        var $ = function(id){return document.getElementById(id)}
        $("box").onmouseover = function(){
            $("list").style.display = "block";
        }
        $("box").onmouseout = function(){
            var obj = event.srcElement;
            if(tid!=null) clearTimeout(tid);
            tid = setTimeout(function(){$("list").style.display = "none"}, 1500);
        }
        $("list").onmouseover = function(){
            if(tid!=null) clearTimeout(tid);
        }
    </script>
</body>
</html>
------解决方案--------------------
1.改css把div和ul拼一起盖掉空白
2.给document加click关闭或者ul里加个关闭按钮