js 实现简单的导航下拉列表

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<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

<style>

    body,ul{margin:0;padding:0;}

    li{width:100px;height:30px;line-height:30px;float:left;border:1px solid #000;text-align:center;background:#00FFFF;list-style:none;position:relative;}

    li div{position:absolute;top:30px;left:0;filter:alpha(opacity=0);opacity:0;width:100%;    height:0;overflow:hidden;}

    /*这里的height:必须要写，overflow:也必须要写，不然没有下拉的效果*/

</style>

<script src="perfectStartMove.js"></script>

<script>

    window.onload = function(){

        var arrLi = document.getElementsByTagName('li');

        for(var i=0;i<arrLi.length;i++){

            arrLi[i].onmouseover = function(){

                var oDiv =     this.getElementsByTagName('div')[0];

                oDiv.style.height = 'auto';

                var heightVlaue = oDiv.offsetHeight;

                oDiv.style.height = 0;

                perfectStartMove(oDiv,{height:heightVlaue,opacity:100});

            };

            arrLi[i].onmouseout = function(){

                var oDiv =     this.getElementsByTagName('div')[0];

                perfectStartMove(oDiv,{height:0,opacity:0});

            };

        }

    };

</script>

</head>

<body>

    <ul>

        <li>

            首页

            <div>

                第三十<br />

                esfsdfds <br />

                dfdfd <br />

                fd

            </div>

        </li>

        <li>

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            <div>

                fcd<br />

                esfsdfds <br />

                dfdfd

            </div>

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            联系我们

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                读书三<br />

                ttt <br />

                dfdfd <br />

                fd

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</body>

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js 实现简单的导航下拉列表

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