菜单扩展

代码

<!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=gb2312" />
<title>菜单扩展1</title>
<style type="text/css">
    #menu
    {
        font-family:Arial, Helvetica, sans-serif;
        font-size:12px;
        width:150px;
        border:solid 1px gray;
        padding:8px;
        margin:8px auto;
        background-color:#ccc;
    }

    #menu a
    {
        display:block;
        padding:4px 8px;/*a标签内容距外宽度*/
        margin:8px 0; /*a标签之间距离*/
        background-color:#fff;
        color:#000;
        text-decoration:none;
        border-left:solid 4px #9ab;
        border-right:solid 4px #9ab;
    }
    #menu a:hover
    {
        color:#990000;
        border-left:solid 4px #000;
        border-right:solid 4px #000;
    }
    #menu a#first,#menu a#last
    {
        margin:0px;
    }

</style>
<style type="text/css">
    #menu1
    {
        font-family:Arial, Helvetica, sans-serif;
        font-size:12px;
        width:150px;
        border:solid 1px gray;
        padding:8px;
        margin:8px auto;
    }

    #menu1 a
    {
        display:block;
        padding:4px 8px;/*a标签内容距外宽度*/
        margin:8px 0; /*a标签之间距离*/
        background-color:#fff;
        color:#000;
        text-decoration:none;
        border:solid 5px #fff;
    }
    #menu1 a:hover
    {
        color:#fff;
        background-color:#aaa;
        border-color:#aaa #ddd; /*此处通过背景色和变宽色差异覆盖形成效果图*/
    }
    #menu1 a#first,#menu1 a#last
    {
        margin:0px;
    }

</style>
<style type="text/css">
    #menu2
    {
        font-family:Arial, Helvetica, sans-serif;
        font-size:12px;
        width:150px;
        border:solid 1px gray;
        padding:8px;
        margin:8px auto;
    }

    #menu2 a span
    {
        display:none;
        width:100px;
        height:30px;
        background-color:#FFFFFF;
    }
    #menu2 a
    {
        display:block;
        padding:4px 8px;/*a标签内容距外宽度*/
        margin:8px 0; /*a标签之间距离*/
        background-color:#fff;
        color:#000;
        text-decoration:none;
        border:solid 0.5em #fff;
        position:relative;
    }
    #menu2 a:hover
    {
        color:#fff;
        background-color:#aaa;
        border-color:#aaa #ddd; /*此处通过背景色和变宽色差异覆盖形成效果图*/

    }
    #menu2 a:hover span.pop
    {
        color:#000000;
        border:solid 1px gray;
        position:absolute;
        left:150px;
        top:0px;
        display:block;
    }
    #menu2 a#first,#menu1 a#last
    {
        margin:0px;
    }

</style>
</head>

<body>
    <div id="menu">
        <a href="#" id="first">Home</a>
        <a href="#">Search</a>
        <a href="#">Contract</a>
        <a href="#">Design</a>
        <a href="#" id="last">Map</a>
    </div>
    <br />
    <div id="menu1">
        <a href="#" id="first">Home</a>
        <a href="#">Search</a>
        <a href="#">Contract</a>
        <a href="#">Design</a>
        <a href="#" id="last">Map</a>
    </div>
    <br />
    <div id="menu2">
        <a href="#" id="first">
            Home
            <span class="pop">home的内容</span>
        </a>
        <a href="#">
            Search
            <span class="pop">Search的内容</span>
        </a>
        <a href="#">
            Contract
            <span class="pop">Contract的内容</span>
        </a>
        <a href="#">
            Design
            <span class="pop">Design的内容</span>
        </a>
        <a href="#" id="last">
            Map
            <span class="pop">Map的内容</span>
        </a>
    </div>
</body>
</html>

　　该例子主要通过对边框的控制，合理利用边框和背景色，span标签实现特定的效果。对于类似弹出菜单这样的选项原理即是如此，可进一步扩展，效果图如下：

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原文地址：https://www.cnblogs.com/tzy080112/p/1715799.html