javascript-下拉菜单的实现

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<html>
<head>
<title>下拉菜单示例</title>
<script language="javascript">
//当鼠标移到菜单选项的时候显示对应的DIV
function show(menu)
{
document.getElementById(menu).style.visibility="visible";
}
//当鼠标移出的时候隐藏所有的DIV
function hide()
{
document.getElementById("menu1").style.visibility="hidden";
document.getElementById("menu2").style.visibility="hidden";
document.getElementById("menu3").style.visibility="hidden";
}
</script>
</head>
<body>
<table>
<tr bgcolor="#9999FF">
<td width="80" onMouseMove="show('menu1')" onMouseOut="hide()">菜单一</td>
<td width="80" onMouseMove="show('menu2')" onMouseOut="hide()">菜单二</td>
<td width="80" onMouseMove="show('menu3')" onMouseOut="hide()">菜单三</td>
</tr>
</table>
<div id="menu1" onMouseMove="show('menu1')"
onMouseOut="hide()" style="background:#9999FF;position:absolute;left=12;top=38;width=80;
visibility=hidden">
<span>子菜单一</span><br>
<span>子菜单二</span><br>
<span>子菜单三</span><br>
</div>
<div id="menu2" onMouseMove="show('menu2')"
onMouseOut="hide()" style="background:#9999FF;position:absolute;left=95;top=38;width=80;
visibility=hidden">
<span >子菜单一</span><br>
<span>子菜单二</span><br>
<span>子菜单三</span><br>
</div>
<div id="menu3" onMouseMove="show('menu3')"
onMouseOut="hide()" style="background:#9999FF;position:absolute;left=180;top=38;width=80;
visibility=hidden">
<span >子菜单一</span><br>
<span>子菜单二</span><br>
<span>子菜单三</span><br>
</div>
</body>
</html>
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