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在网页设计中，创建交互式的下拉菜单是一个重要的部分，它能提高用户体验并使网站导航更加高效。"good_menu.rar" 提供了一个基于 HTML 和 CSS 的下拉菜单示例，让我们来深入了解一下这个主题。 HTML（HyperText Markup Language）是网页内容的基础结构语言，而 CSS（Cascading Style Sheets）则负责网页的样式和布局。在这个例子中，`good_menu.html` 文件包含了这两个元素的结合。HTML 结构通常包含一系列的 `li`（列表项）元素，它们被组织在一个 `ul`（无序列表）元素内，用于构建菜单项。每个 `li` 元素可能包含一个链接（`a` 标签），并且可以嵌套另一个 `ul` 来创建子菜单。 HTML 结构可能如下： ```html <ul class="menu"> <li><a href="#">菜单1</a> <ul> <li><a href="#">子菜单1.1</a></li> <li><a href="#">子菜单1.2</a></li> </ul> </li> <li><a href="#">菜单2</a></li>  </ul> ``` 接下来，CSS 负责让这些菜单项看起来美观并实现下拉效果。这通常涉及以下关键样式： 1. 隐藏默认的子菜单：使用 `display: none;` 可以在初始状态下隐藏子菜单。 2. 悬停时显示子菜单：通过将 `display` 设置为 `block` 或 `flex`，可以在鼠标悬停在父菜单项上时显示子菜单。 3. 布局和定位：使用 `position` 属性（如 `relative` 和 `absolute`）调整菜单项的位置，确保子菜单在其父元素下方正确显示。 4. 鼠标悬停样式：添加 `:hover` 伪类以改变菜单项在鼠标悬停时的背景色、文字颜色等。 5. 阴影和过渡效果：应用 `box-shadow` 和 `transition` 属性为下拉菜单添加阴影和平滑过渡效果，增强用户体验。 CSS 示例： ```css .menu { position: relative; } .menu li { position: relative; } .menu ul { display: none; position: absolute; } .menu li:hover > ul { display: block; } .menu li:hover { background-color: #f2f2f2; /* 自定义颜色 */ } .menu a { display: block; padding: 10px; text-decoration: none; color: #333; } .menu a:hover { color: #fff; /* 自定义颜色 */ } ``` 这个下拉菜单的例子提供了一个基本的框架，但还可以根据需求进行定制，例如添加动画效果、响应式设计以适应不同设备，或者调整字体、间距等细节。与社区交流和分享这样的代码片段可以帮助初学者学习，同时促进开发者之间的合作和知识共享。 HTML 和 CSS 下拉菜单的实现涉及到理解 HTML 结构和 CSS 选择器、定位以及交互样式。通过不断地实践和学习，你可以创造出更复杂、更个性化的菜单设计，以满足各种网页项目的需求。

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good_menu.rar （1个子文件）

good_menu.html 12KB

<!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> <FCK:meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>CSS+XHTML三级下拉菜单代码 96看吧</title> </head> <style type="text/css"> /* ================================================================ This copyright notice must be untouched at all times. The original version of this stylesheet and the associated (x)html is available at http://www.cssplay.co.uk/menus/drop_variations.html Copyright (c) 2005-2007 Stu Nicholls. All rights reserved. This stylesheet and the assocaited (x)html may be modified in any way to fit your requirements. =================================================================== */ /* common styling */ /* Set up the default font and ovrall size to include image */ body { background: #fff; font-family: "Lucida Grande", Helvetica, Arial, sans-serif; font-size: 12px; } /* style the outer div to give it width */ .menu {font-size:12px; padding-bottom:200px; width:700px;} /* remove all the bullets, borders and padding from the default list styling */ .menu ul {padding:0;margin:0;list-style-type:none; height:3em; background:transparent;} /* style the sub-level lists */ .menu ul ul {width:15em;} /* float the top list items to make it horizontal and a relative positon so that you can control the dropdown menu positon */ .menu ul li {float:left;height:3em;line-height:3em; display:block;} /* style the sub level list items */ .menu ul ul li {display:block;width:12em;height:auto; line-height:1em;} /* style the links for the top level */ .menu a, .menu a:visited {display:block;float:left;height:100%; width:7em; font-size:1em;text-decoration:none;color:#fff;background:#949e7c url(/uploadfile/2009/4/10/2009041017450825.gif) center center; padding:0 3em 0 1em; border-left:1px solid #eee; border-right:1px solid #000;} /* hack IE5.x to get the correct the faulty box model and get the width right */ * html .menu a, * html .menu a:visited {width:11em; w\idth:7em;} /* style the sub level links */ .menu ul ul a, .menu ul ul a:visited {display:block;background:#5b8686 url(/uploadfile/2009/4/10/2009041017454784.gif); color:#fff;width:12em;height:100%;line-height:1em; padding:0.5em 1em; border-bottom:1px solid #7aa;} * html .menu ul ul a, * html .menu ul ul a:visited {width:14em; w\idth:12em;} /* style the table so that it takes no part in the layout - required for IE to work */ .menu table {border-collapse:collapse; padding:0; margin:-1px; width:0; height:0; font-size:1em; z-index:1;} /* style the third level background */ .menu ul ul ul a, .menu ul ul ul a:visited {background:#b4be9c url(/uploadfile/2009/4/10/2009041017454784.gif);} /* style the fourth level background */ .menu ul ul ul ul a, .menu ul ul ul ul a:visited {background:#c4ceac url(/uploadfile/2009/4/10/2009041017454784.gif);} /* style the sub level 1 background */ .menu ul :hover a.sub1 {background:#447b7b;} /* style the sub level 2 background */ .menu ul ul :hover a.sub2 {background:#447b7b;} /* style the level hovers */ /* first */ * html .menu a:hover {color:#ff0;background:#d4d8bd url(/uploadfile/2009/4/10/2009041017494818.gif) center center; position:relative; z-index:100;} .menu li:hover {position:relative;} .menu :hover > a {color:#ff0;background:#d4d8bd url(/uploadfile/2009/4/10/2009041017494818.gif) center center;} /* second */ * html .menu ul ul a:hover{color:#ff0;background:#7aa; position:relative; z-index:110;} .menu ul ul li:hover {position:relative;} .menu ul ul :hover > a {color:#ff0;background:#7aa;} /* third */ * html .menu ul ul ul a:hover {background:#7aa; position:relative; z-index:120;} .menu ul ul ul :hover > a {background:#7aa;} /* fourth */ .menu ul ul ul ul a:hover {background:#7aa; position:relative; z-index:130;} /* hide the sub levels and give them a positon absolute so that they take up no room */ .menu ul ul {visibility:hidden;position:absolute;height:0;top:3em; left:0; width:14em;} /* position the third level flyout menu */ .menu ul ul ul{left:12em;top:0;width:14em;} /* make the second level visible when hover on first level list OR link */ .menu ul :hover ul{visibility:visible; height:auto; padding:0 3em 3em 3em; background:transparent url(/uploadfile/2009/4/10/2009041017483924.gif); left:-3em;} /* keep the third level hidden when you hover on first level list OR link */ .menu ul :hover ul ul{visibility:hidden;} /* keep the fourth level hidden when you hover on second level list OR link */ .menu ul :hover ul :hover ul ul{visibility:hidden;} /* make the third level visible when you hover over second level list OR link */ .menu ul :hover ul :hover ul{visibility:visible; left:9em;} /* make the fourth level visible when you hover over third level list OR link */ .menu ul :hover ul :hover ul :hover ul {visibility:visible;} </style> <body> <div class="menu"> <ul> <li><a href="/" _fcksavedurl="/">96看吧首页</a>  <ul> <li><a href="../menu/zero_dollars.html" _fcksavedurl="../menu/zero_dollars.html" title="The zero dollar ads page">zero dollars advertising page</a></li> <li><a href="../menu/embed.html" _fcksavedurl="../menu/embed.html" title="Wrapping text around images">wrapping text around images</a></li> <li><a href="../menu/form.html" _fcksavedurl="../menu/form.html" title="Styling forms">styled form</a></li> <li><a href="../menu/nodots.html" _fcksavedurl="../menu/nodots.html" title="Removing active/focus borders">active focus</a></li> <li><a class="sub1" href="../menu/hover_click.html" _fcksavedurl="../menu/hover_click.html" title="Hover/click with no active/focus borders">hover/click with no borders</a>  <ul> <li><a href="../menu/form.html" _fcksavedurl="../menu/form.html" title="Styling forms">styled form</a></li> <li><a href="../menu/nodots.html" _fcksavedurl="../menu/nodots.html" title="Removing active/focus borders">removing active/focus borders</a></li> <li><a class="sub2" href="#nogo" _fcksavedurl="#nogo">FLYOUT third level</a>  <ul> <li><a href="#nogo" _fcksavedurl="#nogo">Third level-1</a></li> <li><a href="#nogo" _fcksavedurl="#nogo">Third level-2</a></li> <li><a href="#nogo" _fcksavedurl="#nogo">Third level-3</a></li> <li><a href="#nogo" _fcksavedurl="#nogo">Third level-4</a></li> </ul>  </li> <li><a href="../menu/hover_click.html" _fcksavedurl="../menu/hover_click.html" title="Hover/click with no active/focus borders">hover/click</a></li> </ul>  </li> <li><a href="../menu/shadow_boxing.html" _fcksavedurl="../menu/shadow_boxing.html" title="Multi-position drop shadow">shadow boxing</a></li> <li><a href="../menu/old_master.html" _fcksavedurl="../menu/old_master.html" title="Image Map for detailed information">image map for detailed information</a></li> <li><a href="../menu/bodies.html" _fcksavedurl="../menu/bodies.html" title="fun with background images">fun with background images</a></li> <li><a href="../menu/fade_scroll.html" _fcksavedurl="../menu/fade_scroll.html" title="fade-out scrolling">fade scrolling</a></li> <li><a href="../menu/em_images.html" _fcksavedurl="../menu/em_images.html" title="em size images compared">em image sizes compared</a></li> </ul>  </li> <li><a href="../boxes/index.html" _fcksavedurl="../boxes/index.html">BOXES</a>  <ul> <li><a href="spies.html" _fcksavedurl="spies.html" title="a coded list of spies">a coded list of spies</a></li> <li><a hr

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