DIV+CSS布局重新学习之css控制ul li实现2级菜单

时间：2023-04-16 14:08:56

竖状菜单：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<script type="text/javascript"><!--//--><![CDATA[//><!--

startList = function() {

    if (document.all&&document.getElementById) {

        navRoot = document.getElementById("menu");

        var allli = navRoot.getElementsByTagName("li")

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

            node = allli[i];

            node.onmouseover=function() {

                this.className+=" current";

            }

            node.onmouseout=function() {

                this.className=this.className.replace(" current", "");

            }

        }

    }

}

window.onload=startList;

//--><!]]></script>

<style type="text/css">

body { font-family: Verdana; font-size: 12px; line-height: 1.5; }

img { border-style: none; }

a { color: #000; text-decoration: none; }

a:hover { color: #F00; }

#menu { width: 100px; border: 1px solid #CCC; border-bottom:none;}

#menu ul { list-style: none; margin: 0px; padding: 0px; }

#menu ul li { background: #eee; padding: 0px 8px; height: 26px; line-height: 26px; border-bottom: 1px solid #CCC; position:relative; }

#menu ul li ul { display:none; position: absolute; left: 100px; top: 0px; width:100px; border:1px solid #ccc; border-bottom:none; }

#menu ul li.current ul { display:block;}

#menu ul li:hover ul { display:block;}

</style>

</head>

<body>

    <div id="menu">

        <ul>

            <li><a href="#">首页</a></li>

            <li><a href="#">网页版式布局</a>

                <ul>

                <li><a href="#">自适应宽度</a></li>

                <li><a href="#">固定宽度</a></li>

                </ul>

            </li>

            <li><a href="#">div+css教程</a>

                <ul>

                <li><a href="#">新手入门</a></li>

                <li><a href="#">视频教程</a></li>

                <li><a href="#">常见问题</a></li>

                </ul>

            </li>

            <li><a href="#">div+css实例</a>

                <ul>

                <li><a href="#">子菜单1</a></li>

                <li><a href="#">子菜单2</a></li>

                <li><a href="#">子菜单3</a></li>

                </ul>

            </li>

            <li><a href="#">常用代码</a></li>

            <li><a href="#">站长杂谈</a></li>

            <li><a href="#">技术文档</a></li>

            <li><a href="#">资源下载</a></li>

            <li><a href="#">图片素材</a></li>

        </ul>

    </div>

</body>

</html>

如果用JQuery来写上面的JS则更简单：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<script type="text/javascript" src="jquery-1.7.2.min.js"></script>

<style type="text/css">

body { font-family: Verdana; font-size: 12px; line-height: 1.5; }

img { border-style: none; }

a { color: #000; text-decoration: none; }

a:hover { color: #F00; }

#menu { width: 100px; border: 1px solid #CCC; border-bottom:none;}

#menu ul { list-style: none; margin: 0px; padding: 0px; }

#menu ul li { background: #eee; padding: 0px 8px; height: 26px; line-height: 26px; border-bottom: 1px solid #CCC; position:relative; }

#menu ul li ul { display:none; position: absolute; left: 100px; top: 0px; width:100px; border:1px solid #ccc; border-bottom:none; }

/*这里就不需要定义这个样式了，使用JQuery的togger方法即可*/

/*

#menu ul li.current ul { display:block;}

#menu ul li:hover ul { display:block;}

*/

</style>

<script type="text/javascript">

    $(function(){

        $("#menu li").bind({

            mouseover: function() {

                $(this).children("ul").toggle();

            },

            mouseout: function() {

                $(this).children("ul").toggle();

            }

        });

    });

</script>

</head>

<body>

    <div id="menu">

        <ul>

            <li><a href="#">首页</a></li>

            <li><a href="#">网页版式布局</a>

                <ul>

                <li><a href="#">自适应宽度</a></li>

                <li><a href="#">固定宽度</a></li>

                </ul>

            </li>

            <li><a href="#">div+css教程</a>

                <ul>

                <li><a href="#">新手入门</a></li>

                <li><a href="#">视频教程</a></li>

                <li><a href="#">常见问题</a></li>

                </ul>

            </li>

            <li><a href="#">div+css实例</a>

                <ul>

                <li><a href="#">子菜单1</a></li>

                <li><a href="#">子菜单2</a></li>

                <li><a href="#">子菜单3</a></li>

                </ul>

            </li>

            <li><a href="#">常用代码</a></li>

            <li><a href="#">站长杂谈</a></li>

            <li><a href="#">技术文档</a></li>

            <li><a href="#">资源下载</a></li>

            <li><a href="#">图片素材</a></li>

        </ul>

    </div>

</body>

</html>

效果如下：

DIV+CSS布局重新学习之css控制ul li实现2级菜单

这里UL和LI的布局的核心参见：DIV布局之positioan详解

横向菜单：

横向菜单的核心就是要让li浮动起来

ul li { width:72px; float:left; margin:20px 0 0px 20px; display:inline; text-align:center;}

menu ul { list-style: none; margin: 0px; padding: 0px; }

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