<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<script>
function ddd(obj, sType) {
var oDiv = document.getElementById(obj);
if (sType == 'show') { oDiv.style.display = 'block';}
if (sType == 'hide') { oDiv.style.display = 'none';}
}
</script>
<a href="#" onmouseover="ddd('aa', 'show');" onmouseout="ddd('aa', 'hide');">显示</a>
<div style="display:none;" id="aa" onmouseover="ddd('aa', 'show');" onmouseout="ddd('aa', 'hide');">
<a href="#">bb </a>
<a href="#">bb </a>
<a href="#">bb </a>
<a href="#">bb </a>
</div>
</div>
</body>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<script>
function ddd(obj, sType) {
var oDiv = document.getElementById(obj);
if (sType == 'show') { oDiv.style.display = 'block';}
if (sType == 'hide') { oDiv.style.display = 'none';}
}
</script>
<a href="#" onmouseover="ddd('aa', 'show');" onmouseout="ddd('aa', 'hide');">显示</a>
<div style="display:none;" id="aa" onmouseover="ddd('aa', 'show');" onmouseout="ddd('aa', 'hide');">
<a href="#">bb </a>
<a href="#">bb </a>
<a href="#">bb </a>
<a href="#">bb </a>
</div>
</div>
</body>
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