京东的左侧导航。如果用纯css如何做出子菜单成为一个整体的效果。如图。

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京东的左侧导航。如果用纯css如何做出子菜单成为一个整体的效果。如图。,第1张

用 a:hover span 试试，如果你 css 非常熟，能处理好很多细节问题，有可能能行，不断的嵌套 a:hover span ，下面这个如果你看得明白的话可以试试：

<ul>

<li>

<a>

家用电器

<span>

<strong>生活电器</strong>

<ul>

<li><a>净化器</a></li>

<li><a>净水设备</a></li>

<li><a>电风扇</a></li>

</sapn>

</a>

</li>

</ul>

核心就是一个链接里面放一个span，然后这个span里面又放二级菜单的链接：

<a>一级菜单<span><ul>二级菜单</ul></sapn></a>

然后先把 span 用 display:none隐藏起来，当一级菜单的链接发生 a:hover 时，又把 span 的 display 设置为 block 使其可见。

纯 css 不上 js 并且：不用表格、条件注释的话，那上面我说的这些就是唯一的办法了。

另一种可能是：上面我说的这些根本做不到你想要的效果，因为我也没试过这么复杂的嵌套会出现什么预料之外的东西要处理，考虑各浏览器兼容问题，能否处理掉这些问题是未知的。

你至少需要解决：

IE6 下 a:hover span 无效(要让其生效需要设置一个多余的空背景，方法自行百度)

各种 z-index 问题

span 的复杂定位

其他莫名其妙的问题

...

最终结果一切未知，有兴趣的话可以自己试着写代码。

给你一个类似的，需要展开的菜单你加一个样式默认隐藏，然后在JS里加一个事件显示就好了

<!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/htmlcharset=gb2312" />

<title>CSS+XHTML代码</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/page_menu2.html

Copyright (c) 2005-2007 Stu Nicholls. All rights reserved.

This stylesheet and the associated (x)html may be modified in any

way to fit your requirements.

=================================================================== */

body {

background: #fff

font-family: "Lucida Grande", Helvetica, Arial, sans-serif

font-size: 12px

}

#hoverpage ul#outer li div p {font-size:12pxline-height:16pxmargin:5px 0 15px 0}

#hoverpage ul#outer li div h2 {line-height:1emcolor:#585font-size:1.5emfont-weight:normalmargin-top:0font-family:verdana, sans-serif}

#hoverpage ul#outer li div h3 {line-height:1emcolor:#66afont-size:1.2emfont-weight:normalmargin-top:0}

#hoverpage ul#outer li div h3.clear {clear:left}

#hoverpage {width:650pxheight:450pxborder:1px solid #aaabackground:#fffposition:relativez-index:500overflow:hiddentext-align:left}

#hoverpage table {border-collapse:collapsemargin:-1px}

#hoverpage ul#outer {background:transparentpadding:0margin:0list-style:none}

#hoverpage ul#outer li.page {display:inline} /* needed for IE to function correctly */

#hoverpage ul#outer li.page a.menuitem {text-decoration:none}

#hoverpage ul#outer li.page i {position:absolutedisplay:blockheight:25pxright:500pxbackground:transparentcursor:defaultz-index:100text-align:righttext-decoration:nonecolor:#080font-style:normalcursor:pointer}

#hoverpage ul#outer li.p1 i {top:30px}

#hoverpage ul#outer li.p2 i {top:55px}

#hoverpage ul#outer li.p3 i {top:80px}

#hoverpage ul#outer li.p4 i {top:105px}

#hoverpage ul#outer li.p5 i {top:130px}

#hoverpage ul#outer li.page div {display:blockwidth:600pxheight:400pxpadding:25pxfont-weight:normalcolor:#444}

#hoverpage ul#outer li.p1 div {background:#fff url(page1_back.jpg)}

#hoverpage ul#outer li.p2 div {background:#fff url(page2_back.jpg)}

#hoverpage ul#outer li.p3 div {background:#fff url(page3_back.jpg)}

#hoverpage ul#outer li.p4 div {background:#fff url(page4_back.jpg)}

#hoverpage ul#outer li.p5 div {background:#fff url(page5_back.jpg)}

#hoverpage ul#outer li div img {border:1px solid #888float:rightmargin:0 10px 5px 0}

#hoverpage ul#outer li div p.big {line-height:1emcolor:#004font-size:1.5em}

#hoverpage ul#outer li div a {color:#00ctext-decoration:underline}

#hoverpage ul#outer li div em {display:blockwidth:190pxheight:230pxfloat:leftbackground:transparent url(current.gif) no-repeatmargin-right:10px}

#hoverpage ul#outer li.p1 div em {background-position: 21px 0}

#hoverpage ul#outer li.p2 div em {background-position: 21px 25px}

#hoverpage ul#outer li.p3 div em {background-position: 21px 50px}

#hoverpage ul#outer li.p4 div em {background-position: 21px 75px}

#hoverpage ul#outer li.p5 div em {background-position: 21px 100px}

#hoverpage ul#outer li.page div a:hover {text-decoration:none}

#hoverpage ul#outer li.page a:hover {white-space:normal} /* for IE6 */

#hoverpage ul#outer :hover div {position:absoluteleft:0top:0}

#hoverpage ul#outer a:hover i {color:#66afont-weight:bold} /* for IE6 */

#hoverpage ul#outer :hover a i {color:#66afont-weight:bold}

#hoverpage ul#outer div ul li {line-height:20pxfont-size:0.9emcolor:#256list-style-type:disc}

#hoverpage ul#outer div ul li a {line-height:20pxfont-size:1.1emcolor:#c00}

#hoverpage ul#outer div dl dd {line-height:20pxfont-size:1.1emcolor:#448}

#hoverpage ul#outer div dl dt {line-height:30pxfont-size:1.3emcolor:#333}

</style>

<body>

<div id="hoverpage">

<ul id="outer">

<li class="page p1"><a href="#nogo" class="menuitem"><i>Products</i><!--[if IE 7]><!--></a><!--<![endif]-->

<!--[if lte IE 6]><table><tr><td><![endif]-->

<div>

<em></em>

<img src="bags.jpg" alt="" />

<h2>Products</h2>

<h3>Lorem Ipsum</h3>

<ul>

<li><a href="#nogo1">Integer nonummy neque.</a></li>

<li><a href="#nogo1">Aliquam accumsan.</a></li>

<li><a href="#nogo1">Nulla in sapien eget eros.</a></li>

<li><a href="#nogo1">Nam varius ante et risus.</a></li>

<li><a href="#nogo1">Phasellus at erat id metus.</a></li>

<li><a href="#nogo1">Donec malesuada ultricies.</a></li>

<li><a href="#nogo1">Duis quis purus sit amet.</a></li>

<li><a href="#nogo1">Morbi porta dapibus enim.</a></li>

</ul>

<h3 class="clear">Product Information</h3>

<p>Suspendisse potenti. Donec viverra molestie enim. Fusce fermentum, erat id cursus aliquam, mauris augue volutpat dolor, in interdum purus pede dictum diam. Morbi interdum diam at ligula. Morbi laoreet. Morbi mollis tristique justo. Etiam accumsan fermentum ipsum. Phasellus vestibulum, leo in dapibus ultricies, nisi nulla fermentum tortor, eu lobortis nibh urna ac dui. Aliquam erat volutpat. Curabitur vitae sapien sed libero dictum pellentesque. Praesent quis enim nec tellus congue hendrerit. Ut tellus. Morbi rhoncus elit lobortis libero.</p>

</div>

<!--[if lte IE 6]></td></tr></table></a><![endif]-->

</li>

<li class="page p2"><a href="#nogo" class="menuitem"><i>Services</i><!--[if IE 7]><!--></a><!--<![endif]-->

<!--[if lte IE 6]><table><tr><td><![endif]-->

<div>

<em></em>

<img src="service.jpg" alt="" />

<h2>Services</h2>

<h3>Curabitur eget</h3>

<ul>

<li><a href="#nogo2">Suspendisse potenti.</a><br />Quisque at ante nec lacus cursus malesuada.</li>

<li><a href="#nogo2">Donec viverra molestie enim.</a><br />Sed ac tortor nec augue hendrerit pulvinar.</li>

<li><a href="#nogo2">Pellentesque habitant.</a><br />Nullam rhoncus hendrerit orci.</li>

<li><a href="#nogo2">Vivamus non turpis.</a><br />Sed lacinia egestas mi.</li>

</ul>

<h3 class="clear">Available Services</h3>

<p>Proin scelerisque justo quis ante. Maecenas vehicula orci quis arcu. Nam dictum lectus quis ipsum. In felis. Cras eu lectus. Nam sed est ut orci venenatis faucibus. Ut molestie massa non massa. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos hymenaeos. Curabitur eget magna a odio vestibulum laoreet. Vivamus faucibus tincidunt massa. Sed a nunc. Quisque varius sagittis libero.</p>

</div>

<!--[if lte IE 6]></td></tr></table></a><![endif]-->

</li>

<li class="page p3"><a href="#nogo" class="menuitem"><i>Latest Information</i><!--[if IE 7]><!--></a><!--<![endif]-->

<!--[if lte IE 6]><table><tr><td><![endif]-->

<div>

<em></em>

<img src="news.jpg" alt="" />

<h2>Latest Information</h2>

<h3>Fusce fermentum</h3>

<ul>

<li><a href="#nogo3">Donec posuere enim a sapien.<br />Malesuada fames ac turpis egestas.</a></li>

<li>Vivamus dignissim tincidunt quam.</li>

<li>Nullam varius vestibulum mauris.</li>

<li>Curabitur faucibus varius dui.<br /><a href="#nogo3">Cras suscipit viverra felis. Nullam diam.</a></li>

<li>Vivamus convallis volutpat nunc.</li>

<li>Sed porttitor dui vel nunc.</li>

</ul>

<h3 class="clear">Latest Product Information</h3>

<p>Nam porttitor congue diam. Donec in mi. Fusce ac neque. Donec quis justo. Nunc non justo quis augue sagittis volutpat. Etiam quis ligula commodo augue tempus pulvinar. Morbi ante arcu, aliquam ut, consequat et, consequat sed, sem. Cras suscipit viverra felis. Nullam diam. Duis eros purus, ornare sit amet, viverra sed, laoreet ac, pede.</p>

</div>

<!--[if lte IE 6]></td></tr></table></a><![endif]-->

</li>

<li class="page p4"><a href="#nogo" class="menuitem"><i>Press Release</i><!--[if IE 7]><!--></a><!--<![endif]-->

<!--[if lte IE 6]><table><tr><td><![endif]-->

<div>

<em></em>

<img src="press.jpg" alt="" />

<h2>Press Release</h2>

<h3>Quisque varius</h3>

<dl>

<dt>11th June 2007</dt>

<dd>In feugiat scelerisque pede.</dd>

<dd>Morbi iaculis eleifend ante.</dd>

<dd>Maecenas fringilla scelerisque erat.</dd>

<dd>Nam <a href="nogo5">accumsan</a>egestas eros.</dd>

</dl>

<h3 class="clear">News and Information</h3>

<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Suspendisse vitae sem. <a href="nogo5">Class aptent taciti</a>sociosqu ad litora torquent per conubia nostra, per inceptos hymenaeos. Donec ut nunc. <a href="nogo5">In dictum, dui nec vehicula vehicula</a>, neque leo faucibus est, porta vehicula nisi odio eu tellus.</p>

</div>

<!--[if lte IE 6]></td></tr></table></a><![endif]-->

</li>

<li class="page p5"><a href="#nogo" class="menuitem"><i>Contact us</i><!--[if IE 7]><!--></a><!--<![endif]-->

<!--[if lte IE 6]><table><tr><td><![endif]-->

<div>

<em></em>

<img src="contact.jpg" alt="" />

<h2>Contact us</h2>

<h3>Donec condimentum</h3>

<ul>

<li>Phasellus vitae arcu et mauris facilisis ornare.</li>

<li>Nullam ultrices <a href="#nogo5">urna nec erat</a>facilisis faucibus.</li>

<li>Ut cursus posuere eros.</li>

<li>Vestibulum <a href="#nogo5">dapibus</a>tortor eu nisl.</li>

<li>Proin ac mauris non lacus pharetra aliquet.</li>

</ul>

<h3 class="clear">Contact Details</h3>

<p>Praesent vehicula interdum massa. Nunc velit erat, pulvinar vitae, tempor non, porttitor non, ipsum. Nullam venenatis, quam a tincidunt semper, neque velit dictum quam, at mattis mauris mauris a dolor. Aliquam urna. <a href="nogo5">Ut pellentesque dapibus quam.</a>Mauris dapibus dictum felis. Praesent tellus quam, aliquet in, malesuada aliquet, pretium non, eros. Cras aliquam ligula vitae nunc.</p>

</div>

<!--[if lte IE 6]></td></tr></table></a><![endif]-->

</li>

</ul>

</div>

<br>

<br>

<br>

<div>

</div>

</body>

</html>

<script language=javascript ></script>

在html head内引用

<link href="你写好的样式表" rel="stylesheet" type="text/css">

不懂 可以问我

望采纳！