什么是面包屑导航(BreadcrumbNavigation)?参见百度百科
面包屑可以在网站中起到导航的作用, 方便读者把握网站结构内容的同时，也便于搜索引擎进行索引. 如果一个网站存在面包屑, 在 Google 中看到的是路径索引, 而不是文章链接, 如下图.
面包屑导航在GOOGLE中的效果
面包屑导航可以让用户可以一级一级找到过来的路，方便返回，这样做的好处是增强用户体验，提高用户黏度。面包屑导航的大体格式就是 首页 » 分类一 » 分类二 » 当前所在页面。
Breadcrumb NavXT和Breadcrumbs这两个插件都可以为wordpress添加面包屑导航，同时我们还可以添加以下代码实现面包屑导航:
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| <div class="dp-highlighter nogutter">
<div class="bar">
</div>
<ol class="dp-c" start="0">
<li class="alt">
<span><span><div id=</span><span class="string">"position"</span><span>> </span></span>
</li>
<li>
<span>当前位置：<a href=</span><span class="string">"<?php bloginfo('url'); ?>"</span><span>><?php bloginfo('name'); ?></a> » </span>
</li>
<li class="alt">
<span><?php </span>
</li>
<li>
<span class="keyword">if</span><span>( is_single() ){ </span>
</li>
<li class="alt">
<span class="vars">$categorys</span><span> = get_the_category(); </span>
</li>
<li>
<span class="vars">$category</span><span> = </span><span class="vars">$categorys</span><span>[0]; </span>
</li>
<li class="alt">
<span class="func">echo</span><span>( get_category_parents(</span><span class="vars">$category</span><span>->term_id,true,' » ') ); </span>
</li>
<li>
<span>the_title(); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_page() ){ </span>
</li>
<li>
<span>the_title(); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_category() ){ </span>
</li>
<li>
<span>single_cat_title(); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_tag() ){ </span>
</li>
<li>
<span>single_tag_title(); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_day() ){ </span>
</li>
<li>
<span>the_time('Y年Fj日'); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_month() ){ </span>
</li>
<li>
<span>the_time('Y年F'); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_year() ){ </span>
</li>
<li>
<span>the_time('Y年'); </span>
</li>
<li class="alt">
<span>} </span><span class="keyword">elseif</span><span> ( is_search() ){ </span>
</li>
<li>
<span class="func">echo</span><span> </span><span class="vars">$s</span><span>.' 的搜索结果'; </span>
</li>
<li class="alt">
<span>} </span>
</li>
<li>
<span>?> </span>
</li>
<li class="alt">
<span></div> </span>
</li>
</ol>
</div>
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