JS CSS写下拉菜单竖行

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <style>

        .one li {

            width: 100px;

            height: 30px;

            line-height: 30px;

            background: url(nav/libg.jpg) no-repeat;

            //float: left;

            text-align: center;

            margin-left: 10px;

            cursor: pointer;

            _display: inline;

            position: relative;

        }

        li ul {

            position: absolute;

            left: 0;

            top: 30px;

            display: none;

        }

        .cd{

            margin-top: -30px;

            margin-left: 65px;

        }

        li{

            list-style: none;

        }

    </style>

</head>

<body>

<ul class="one">

    <li id="li01">

        <span>一级菜单</span>

        <ul id="ul01"class="cd" >

            <li>二级菜单</li>

            <li>二级菜单</li>

            <li>二级菜单</li>

        </ul>

    </li>

    <li id="li02">

        <span>一级菜单</span>

        <ul id="ul02" class="cd" >

            <li>二级菜单</li>

            <li>二级菜单</li>

            <li>二级菜单</li>

        </ul>

    </li>

    <li id="li03">

        <span >一级菜单</span>

        <ul id="ul03"class="cd" >

            <li>二级菜单</li>

            <li>二级菜单</li>

            <li>二级菜单</li>

        </ul>

    </li>

</ul>

<script>

    function fn(canshu1,canshu2){

        var li01 = document.getElementById(canshu1);

        var ul01 = document.getElementById(canshu2);

        li01.onmouseover = function(){

            ul01.style.display = "block"

        }

        li01.onmouseout = function(){

            ul01.style.display = "none"

        }

    }

    fn("li01","ul01")

    fn("li02","ul02")

    fn("li03","ul03")

</script>

</body>

</html>
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