如何通过html和css完成下拉菜单的制作?
例如这种,当然这只是一个例子,其他的也行,如果可以,请简要说明一下用到哪些技能点和原理。
回复内容:
几个下拉菜单display:none按钮 :hover 给下拉菜单display:block
也许可以 无脚本,纯HTML和 CSS 实现的多级下拉菜单,在非 IE 内核浏览器和 IE8+ 表现完美。

主体使用ul>li>ul>li>......嵌套定义多级。
<span class="cp"><!DOCTYPE HTML></span> <span class="nt"><html></span> <span class="nt"><head></span> <span class="nt"><meta</span> <span class="na">http-equiv=</span><span class="s">"Content-Type"</span> <span class="na">content=</span><span class="s">"text/html; charset=utf-8"</span><span class="nt">></span> <span class="nt"><title></span>纯 CSS 多级菜单<span class="nt"></title></span> <span class="nt"><style></span> <span class="nc">.menu</span><span class="p">{}</span> <span class="nc">.menu</span> <span class="nt">ul</span><span class="o">,</span><span class="nc">.menu</span> <span class="nt">li</span><span class="p">{</span><span class="k">margin</span><span class="o">:</span><span class="m">0</span><span class="p">;</span> <span class="k">padding</span><span class="o">:</span><span class="m">0</span><span class="p">;</span><span class="k">list-style</span><span class="o">:</span><span class="k">none</span> <span class="k">outside</span><span class="p">;}</span> <span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="p">{</span><span class="k">overflow</span><span class="o">:</span><span class="k">auto</span><span class="p">;</span> <span class="k">display</span><span class="o">:</span><span class="k">inline</span><span class="o">-</span><span class="k">block</span><span class="p">;}</span> <span class="nc">.menu</span> <span class="nt">a</span><span class="o">,</span><span class="nc">.menu</span> <span class="nt">span</span><span class="p">{</span> <span class="k">cursor</span><span class="o">:</span><span class="k">default</span><span class="p">;</span> <span class="k">height</span><span class="o">:</span><span class="m">30px</span><span class="p">;</span> <span class="k">line-height</span><span class="o">:</span><span class="m">30px</span><span class="p">;</span> <span class="k">padding</span><span class="o">:</span><span class="m">0</span> <span class="m">5px</span><span class="p">;</span> <span class="k">display</span><span class="o">:</span><span class="k">block</span><span class="p">;</span> <span class="k">text</span><span class="o">-</span><span class="k">overflow</span><span class="o">:</span><span class="n">ellipsis</span><span class="p">;</span> <span class="k">overflow</span><span class="o">:</span><span class="k">hidden</span><span class="p">;</span> <span class="k">text-decoration</span><span class="o">:</span><span class="k">none</span><span class="p">;</span> <span class="k">color</span><span class="o">:</span><span class="n">MenuText</span><span class="p">;}</span> <span class="nc">.menu</span> <span class="nt">a</span><span class="nd">:hover</span><span class="o">,</span><span class="nc">.menu</span> <span class="nt">span</span><span class="nd">:hover</span><span class="o">,</span><span class="nc">.menu</span> <span class="nt">li</span><span class="nd">:hover</span><span class="o">></span><span class="nt">a</span><span class="o">,</span><span class="nc">.menu</span> <span class="nt">li</span><span class="nd">:hover</span><span class="o">></span><span class="nt">span</span><span class="p">{</span><span class="k">color</span><span class="o">:</span><span class="n">HighlightText</span><span class="p">;}</span> <span class="nc">.menu</span> <span class="nt">li</span><span class="nd">:hover</span><span class="p">{</span><span class="k">background-color</span><span class="o">:</span><span class="n">Highlight</span><span class="p">;}</span> <span class="nc">.menu</span> <span class="nt">li</span><span class="nd">:hover</span><span class="o">></span><span class="nt">ul</span><span class="p">{</span><span class="k">display</span><span class="o">:</span><span class="k">block</span><span class="p">;}</span> <span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span><span class="p">{</span><span class="k">float</span><span class="o">:</span><span class="k">left</span><span class="p">;}</span> <span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span> <span class="nt">ul</span><span class="p">{</span><span class="k">display</span><span class="o">:</span><span class="k">none</span><span class="p">;</span><span class="k">float</span><span class="o">:</span><span class="k">left</span><span class="p">;</span> <span class="k">background-color</span><span class="o">:</span><span class="m">#fff</span><span class="p">;</span> <span class="k">border</span><span class="o">:</span><span class="m">1px</span> <span class="k">solid</span> <span class="n">Highlight</span><span class="p">;</span> <span class="k">position</span><span class="o">:</span><span class="k">absolute</span><span class="p">;}</span> <span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span> <span class="nt">li</span><span class="p">{</span><span class="k">padding-left</span><span class="o">:</span><span class="m">25px</span><span class="p">;</span><span class="k">margin</span><span class="o">:</span><span class="m">2px</span><span class="p">;</span><span class="k">background</span><span class="o">:</span><span class="k">transparent</span> <span class="sx">url(data:image/gif;base64,R0lGODlhEAAQAIAAAJmZmf///yH5BAAAAAAALAAAAAAQABAAAAIjhI9pwe2+nmRRIQrmjBrmYB1Y93Ak+IXVd6LtiIZwa5JqWAAAOw==)</span> <span class="k">no-repeat</span> <span class="m">5px</span> <span class="k">center</span><span class="p">;</span> <span class="k">width</span><span class="o">:</span><span class="m">150px</span><span class="p">;}</span> <span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span> <span class="nt">ul</span><span class="p">{</span><span class="k">margin-left</span><span class="o">:</span><span class="m">140px</span><span class="p">;</span> <span class="k">margin-top</span><span class="o">:-</span><span class="m">30px</span><span class="p">;}</span> <span class="nc">.menu</span> <span class="nt">li</span><span class="nc">.expand</span><span class="o">></span><span class="nt">a</span><span class="o">,</span><span class="nc">.menu</span> <span class="nt">li</span><span class="nc">.expand</span><span class="o">></span><span class="nt">span</span><span class="p">{</span><span class="k">background</span><span class="o">:</span><span class="k">transparent</span> <span class="sx">url(data:image/png;base64,R0lGODlhAwAQAIABAAAAAP///yH5BAEAAAEALAAAAAADABAAAAIKjI8JBtv/wko0FQA7)</span> <span class="k">no-repeat</span> <span class="k">right</span> <span class="k">center</span><span class="p">;</span> <span class="k">padding-right</span><span class="o">:</span><span class="m">10px</span><span class="p">;</span> <span class="k">margin-right</span><span class="o">:</span><span class="m">5px</span><span class="p">;}</span> <span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span><span class="nc">.expand</span><span class="o">></span><span class="nt">a</span><span class="o">,</span><span class="nc">.menu</span><span class="o">></span><span class="nt">ul</span><span class="o">></span><span class="nt">li</span><span class="nc">.expand</span><span class="o">></span><span class="nt">span</span><span class="p">{</span> <span class="k">background-image</span><span class="o">:</span><span class="sx">url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAADCAYAAACwAX77AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAaSURBVBhXY2BgYPiPAwOFMSXBgjAA0wnmAwASVQv19UVKmwAAAABJRU5ErkJggg==)</span><span class="p">;}</span> <span class="nt"></style></span> <span class="nt"></head></span> <span class="nt"><body></span> <span class="nt"><div</span> <span class="na">id=</span><span class="s">"mainnav"</span> <span class="na">class=</span><span class="s">"menu"</span><span class="nt">></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li</span> <span class="na">class=</span><span class="s">"expand"</span><span class="nt">><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li</span> <span class="na">class=</span><span class="s">"expand"</span><span class="nt">><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>很长很长很长很长很长很长很长很长很长很长<span class="nt"></a></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li</span> <span class="na">class=</span><span class="s">"expand"</span><span class="nt">><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>LinkLink<span class="nt"></a></span> <span class="nt"><ul></span> <span class="nt"><li</span> <span class="na">class=</span><span class="s">"expand"</span><span class="nt">><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li</span> <span class="na">class=</span><span class="s">"expand"</span><span class="nt">><span></span>span 菜单项<span class="nt"></span></span> <span class="nt"><ul></span> <span class="nt"><li><span></span>span 菜单项<span class="nt"></span></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Link<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></div></span> <span class="nt"></body></span> <span class="nt"></html></span>
下面开说:
感觉用select标签效果好像不是很好,效果如下:

首先复习一下基本知识:
display:



代码如下:

希望大神们能批评指正
最后的效果如图:

<span class="cp"><!DOCTYPE html></span> <span class="nt"><html</span> <span class="na">lang=</span><span class="s">"en"</span><span class="nt">></span> <span class="nt"><head></span> <span class="nt"><meta</span> <span class="na">charset=</span><span class="s">"UTF-8"</span><span class="nt">></span> <span class="nt"><title></span>下拉菜单<span class="nt"></title></span> <span class="nt"><style </span><span class="na">type=</span><span class="s">"text/css"</span><span class="nt">></span> <span class="nc">.bt</span><span class="p">{</span> <span class="k">width</span><span class="o">:</span> <span class="m">50px</span><span class="p">;</span><span class="k">height</span><span class="o">:</span> <span class="m">28px</span><span class="p">;</span> <span class="k">border</span><span class="o">:</span> <span class="m">1px</span> <span class="k">solid</span> <span class="m">#ddd</span><span class="p">;</span> <span class="k">background-color</span><span class="o">:</span> <span class="m">#eee</span><span class="p">;</span> <span class="k">font</span><span class="o">:</span><span class="m">12px</span> <span class="s2">"宋体"</span><span class="p">;</span> <span class="p">}</span> <span class="nc">.ct</span><span class="p">{</span> <span class="k">display</span><span class="o">:</span> <span class="k">none</span><span class="p">;}</span> <span class="nc">.dt</span><span class="p">{</span> <span class="k">height</span><span class="o">:</span> <span class="m">30px</span><span class="p">;</span> <span class="k">margin-top</span><span class="o">:</span> <span class="m">0px</span><span class="p">;</span> <span class="k">border</span><span class="o">:</span> <span class="m">1px</span> <span class="k">solid</span> <span class="m">#ddd</span><span class="p">;</span> <span class="k">background-color</span><span class="o">:</span> <span class="nb">white</span><span class="p">;</span> <span class="k">padding</span><span class="o">:</span><span class="k">auto</span> <span class="m">10px</span><span class="p">;</span> <span class="p">}</span> <span class="nc">.dt1</span><span class="p">{</span> <span class="k">height</span><span class="o">:</span> <span class="m">30px</span><span class="p">;</span> <span class="k">margin-top</span><span class="o">:</span> <span class="m">1px</span><span class="p">;</span> <span class="k">border</span><span class="o">:</span> <span class="m">1px</span> <span class="k">solid</span> <span class="m">#ddd</span><span class="p">;</span> <span class="k">background-color</span><span class="o">:</span> <span class="nb">white</span><span class="p">;</span> <span class="k">padding</span><span class="o">:</span><span class="k">auto</span> <span class="m">10px</span><span class="p">;}</span> <span class="nc">.dt</span><span class="nd">:hover</span><span class="o">,</span><span class="nc">.dt1</span><span class="nd">:hover</span><span class="p">{</span><span class="k">background-color</span><span class="o">:</span> <span class="m">#ddd</span><span class="p">;}</span> <span class="nc">.bt</span><span class="nd">:hover</span><span class="p">{</span><span class="k">background-color</span><span class="o">:</span> <span class="nb">green</span><span class="p">;}</span> <span class="nc">.at</span><span class="nd">:hover</span> <span class="nc">.ct</span><span class="p">{</span><span class="k">display</span><span class="o">:</span> <span class="k">inline</span><span class="o">-</span><span class="k">block</span><span class="p">;}</span> <span class="nt"></style></span> <span class="nt"></head></span> <span class="nt"><body></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"at"</span><span class="nt">></span> <span class="nt"><div></span> <span class="nt"><button</span> <span class="na">class=</span><span class="s">"bt"</span> <span class="na">type=</span><span class="s">"button"</span> <span class="nt">></span>按钮<span class="nt"></button></span> <span class="nt"></div></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"ct"</span> <span class="nt">></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"dt1"</span><span class="nt">></span>下拉菜单<span class="nt"></div></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"dt"</span><span class="nt">></span>下拉菜单<span class="nt"></div></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"dt"</span><span class="nt">></span>下拉菜单<span class="nt"></div></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"dt"</span><span class="nt">></span>下拉菜单<span class="nt"></div></span> <span class="nt"></div></span> <span class="nt"></div></span> <span class="nt"></div></span> <span class="nt"></body></span> <span class="nt"></html></span>
做这个功能不难,难的是如何封装和复用。
个人看好polymer这种解决方案。
<span class="cp"><!DOCTYPE html></span> <span class="nt"><html></span> <span class="nt"><head></span> <span class="nt"><meta</span> <span class="na">charset=</span><span class="s">"utf-8"</span><span class="nt">></span> <span class="nt"><title></span>css实现下拉菜单<span class="nt"></title></span> <span class="nt"><style </span><span class="na">type=</span><span class="s">"text/css"</span><span class="nt">></span> <span class="o">*</span><span class="p">{</span> <span class="k">margin</span><span class="o">:</span> <span class="m">0</span><span class="p">;</span> <span class="k">padding</span><span class="o">:</span> <span class="m">0</span><span class="p">;</span> <span class="p">}</span> <span class="nf">#nav</span><span class="p">{</span> <span class="k">background-color</span><span class="o">:</span> <span class="m">#eee</span><span class="p">;</span> <span class="k">width</span><span class="o">:</span> <span class="m">300px</span><span class="p">;</span> <span class="k">height</span><span class="o">:</span> <span class="m">40px</span><span class="p">;</span> <span class="k">margin</span><span class="o">:</span> <span class="m">0</span> <span class="k">auto</span><span class="p">;</span> <span class="p">}</span> <span class="nt">ul</span><span class="p">{</span> <span class="k">list-style</span><span class="o">:</span> <span class="k">none</span><span class="p">;</span> <span class="p">}</span> <span class="nt">ul</span> <span class="nt">li</span> <span class="p">{</span> <span class="k">float</span><span class="o">:</span> <span class="k">left</span><span class="p">;</span> <span class="k">line-height</span><span class="o">:</span> <span class="m">40px</span><span class="p">;</span> <span class="k">text-align</span><span class="o">:</span> <span class="k">center</span><span class="p">;</span> <span class="p">}</span> <span class="nt">a</span><span class="p">{</span> <span class="k">text-decoration</span><span class="o">:</span> <span class="k">none</span><span class="p">;</span> <span class="k">color</span><span class="o">:</span><span class="m">#000</span><span class="p">;</span> <span class="k">padding</span><span class="o">:</span> <span class="m">0</span> <span class="m">10px</span><span class="p">;</span> <span class="k">display</span><span class="o">:</span> <span class="k">block</span><span class="p">;</span> <span class="p">}</span> <span class="nt">a</span><span class="nd">:hover</span><span class="p">{</span> <span class="k">color</span><span class="o">:</span> <span class="m">#fff</span><span class="p">;</span> <span class="k">background-color</span><span class="o">:</span> <span class="m">#666</span><span class="p">;</span> <span class="p">}</span> <span class="nt">ul</span> <span class="nt">li</span> <span class="nt">ul</span> <span class="nt">li</span><span class="p">{</span> <span class="k">float</span><span class="o">:</span> <span class="k">none</span><span class="p">;</span> <span class="k">background-color</span><span class="o">:</span> <span class="m">#eee</span><span class="p">;</span> <span class="k">margin-top</span><span class="o">:</span> <span class="m">2px</span><span class="p">;</span> <span class="p">}</span> <span class="nt">ul</span> <span class="nt">li</span> <span class="nt">ul</span> <span class="p">{</span> <span class="k">position</span><span class="o">:</span> <span class="k">absolute</span><span class="p">;</span> <span class="k">display</span><span class="o">:</span> <span class="k">none</span><span class="p">;</span> <span class="p">}</span> <span class="nt">ul</span> <span class="nt">li</span> <span class="nt">ul</span> <span class="nt">li</span> <span class="nt">a</span><span class="nd">:hover</span><span class="p">{</span> <span class="k">background-color</span><span class="o">:</span> <span class="m">#06f</span><span class="p">;</span> <span class="p">}</span> <span class="nt">ul</span> <span class="nt">li</span><span class="nd">:hover</span> <span class="nt">ul</span><span class="p">{</span> <span class="k">display</span><span class="o">:</span> <span class="k">block</span><span class="p">;</span> <span class="p">}</span> <span class="nt"></style></span> <span class="nt"></head></span> <span class="nt"><body></span> <span class="nt"><div</span> <span class="na">id=</span><span class="s">"nav"</span><span class="nt">></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>按钮1<span class="nt"></a></li></span> <span class="nt"><li></span> <span class="nt"><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>按钮2<span class="nt"></a></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>下拉菜单项<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>下拉菜单项<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li></span> <span class="nt"><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>按钮3<span class="nt"></a></span> <span class="nt"><ul></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>下拉菜单项<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>下拉菜单项<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>下拉菜单项<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>按钮4<span class="nt"></a></li></span> <span class="nt"><li><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>按钮5<span class="nt"></a></li></span> <span class="nt"></ul></span> <span class="nt"></div></span> <span class="nt"></body></span> <span class="nt"></html></span>
这里大部分答案都是hover事件触发下拉菜单出现。其实我总觉得这样不太自然,所以我尽力去做成(伪)点击触发。
---------------------------------------------------------------------
# 具体想法:
菜单是, 下拉菜单的容器是
然后利用a:focus + .dropdown{ ... } 来实现。
---------------------------------------------------------------------
要点1:CSS如何实现影响其他元素?
看这里 > html - How to affect other elements when a div is hovered
要点2: 如何做出(伪)点击触发?
基本用 a:focus,个人感觉自然一点。当然如果失去焦点,下拉菜单容器也会相应地隐藏。
--------------------------------------------------------------------
# HTML BODY 部分代码:
<span class="nt"><body></span> <span class="nt"><a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">></span>Menu<span class="nt"></a></span> <span class="nt"><div</span> <span class="na">class=</span><span class="s">"drop-down"</span> <span class="na">id=</span><span class="s">"drop-down"</span><span class="nt">></span> <span class="nt"><ul></span> <span class="nt"><li></span>Option 1<span class="nt"></li></span> <span class="nt"><li></span>Option 2<span class="nt"></li></span> <span class="nt"><li></span>Option 3<span class="nt"></li></span> <span class="nt"><li></span>Option 4<span class="nt"></li></span> <span class="nt"></ul></span> <span class="nt"></div></span> <span class="nt"></body></span>
原答案如下
===========================
楼上有同学写了css用伪类:hover实现的下拉菜单 这是一种 我再补充下
下拉菜单抛开样式的不同 交互上无非两种
鼠标移到button上出现菜单(如楼上)
以及点击后出现菜单(我要说的)
题主问的是html+css 而很多同学提到了用js添加click事件 这也是大多数下拉菜单的做法
不过为了不跑题 就只用html+css 不用js 那就考css基本功了
这里简单说下思路
html结构如下
<span class="nt"><button></span>点击我出现下拉菜单<span class="nt"></button></span> <span class="nt"><input</span> <span class="na">type=</span><span class="s">"checkbok"</span><span class="nt">></span> <span class="nt"><div></span> <span class="nt"><ul></span> <span class="nt"><li></span>XXX<span class="nt"></li></span> <span class="nt"><li></span>XXX<span class="nt"></li></span> <span class="nt"><li></span>XXX<span class="nt"></li></span> <span class="nt"><li></span>XXX<span class="nt"></li></span> <span class="nt"></ul></span> <span class="nt"></div></span>
如果想用纯css实现click效果:
http://tympanus.net/codrops/2012/12/17/css-click-events/

Outils d'IA chauds

Undresser.AI Undress
Application basée sur l'IA pour créer des photos de nu réalistes

AI Clothes Remover
Outil d'IA en ligne pour supprimer les vêtements des photos.

Undress AI Tool
Images de déshabillage gratuites

Clothoff.io
Dissolvant de vêtements AI

AI Hentai Generator
Générez AI Hentai gratuitement.

Article chaud

Outils chauds

Bloc-notes++7.3.1
Éditeur de code facile à utiliser et gratuit

SublimeText3 version chinoise
Version chinoise, très simple à utiliser

Envoyer Studio 13.0.1
Puissant environnement de développement intégré PHP

Dreamweaver CS6
Outils de développement Web visuel

SublimeText3 version Mac
Logiciel d'édition de code au niveau de Dieu (SublimeText3)

Sujets chauds

Cet article explique comment intégrer l'audio dans HTML5 en utilisant l'AUDIO & GT; Element, y compris les meilleures pratiques pour la sélection du format (MP3, Ogg Vorbis), l'optimisation des fichiers et le contrôle JavaScript pour la lecture. Il met l'accent sur l'utilisation de plusieurs audio F

L'article discute de l'utilisation de l'API de visibilité de la page HTML5 pour détecter la visibilité de la page, améliorer l'expérience utilisateur et optimiser l'utilisation des ressources. Les aspects clés comprennent la pause des supports, la réduction de la charge du processeur et la gestion de l'analyse en fonction des changements de visibilité.

Cet article explique comment créer et valider les formulaires HTML5. Il détaille le & lt; formulaire & gt; élément, types d'entrée (texte, e-mail, numéro, etc.) et attributs (requis, modèle, min, max). Les avantages des formes HTML5 sur les méthodes plus anciennes, incl

L'article discute de l'utilisation de balises Meta pour contrôler la mise à l'échelle des pages sur les appareils mobiles, en se concentrant sur des paramètres tels que la largeur et l'échelle initiale pour une réactivité et des performances optimales. COMMANDE: 159

L'article traite de la gestion de la confidentialité de l'emplacement des utilisateurs et des autorisations à l'aide de l'API Geolocation, mettant l'accent sur les meilleures pratiques pour demander des autorisations, assurer la sécurité des données et se conformer aux lois sur la confidentialité.

Cet article détaille la création de jeux HTML5 interactifs à l'aide de JavaScript. Il couvre la conception de jeux, la structure HTML, le style CSS, la logique JavaScript (y compris la gestion des événements et l'animation) et l'intégration audio. Bibliothèques JavaScript essentielles (Phaser, Pi

L'article explique comment utiliser l'API des notifications HTML5 pour afficher les notifications de bureau, en se concentrant sur les exigences d'autorisation, la personnalisation et la prise en charge du navigateur.

Cet article explique l'API HTML5 WebSockets pour la communication client-serveur bidirectionnelle en temps réel. Il détaille les implémentations côté client (JavaScript) et côté serveur (Python / Flask), résolvant des défis tels que l'évolutivité, la gestion de l'état, un
