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文件，<code>Layout</code>组件将只被调用一次，并且整个站点和该特定页面的元数据将分别暴露为 <code>this.$site</code> 和 <code>this.$page</code> 属性被注入到应用程序中的每个组件里。</p>\n<p>这是这个网站的 <code>$site</code> 值：</p>\n\x3c!--beforebegin--\x3e<div class="language-json extra-class">\x3c!--afterbegin--\x3e<pre v-pre class="language-json"><code><span class="token punctuation">{</span>\n  <span class="token property">"title"</span><span class="token operator">:</span> <span class="token string">"VuePress"</span><span class="token punctuation">,</span>\n  <span class="token property">"description"</span><span class="token operator">:</span> <span class="token string">"Vue-powered Static Site Generator"</span><span class="token punctuation">,</span>\n  <span class="token property">"base"</span><span class="token operator">:</span> <span class="token string">"/"</span><span class="token punctuation">,</span>\n  <span class="token property">"pages"</span><span class="token operator">:</span> <span class="token punctuation">[</span>\n    <span class="token punctuation">{</span>\n      <span class="token property">"lastUpdated"</span><span class="token operator">:</span> <span class="token number">1524027677000</span><span class="token punctuation">,</span>\n      <span class="token property">"path"</span><span class="token operator">:</span> <span class="token string">"/"</span><span class="token punctuation">,</span>\n      <span class="token property">"title"</span><span class="token operator">:</span> <span class="token string">"VuePress"</span><span class="token punctuation">,</span>\n      <span class="token property">"frontmatter"</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n    <span class="token punctuation">}</span><span class="token punctuation">,</span>\n    ...\n  <span class="token punctuation">]</span>\n<span class="token punctuation">}</span>\n</code></pre>\n\x3c!--beforeend--\x3e</div>\x3c!--afterend--\x3e<p><code>title</code>，<code>description</code> 和 <code>base</code> 从 <code>.vuepress/config.js</code> 中的相应字段复制而来。 <code>pages</code> 包含每个页面的元数据对象数组，包括其路径，页面标题（在 <router-link to="./markdown.html#front-matter">YAML front matter</router-link> 中显式指定或从页面上的第一个标题推断）以及该文件中的任意 YAML frontmatter 数据。</p>\n<p>这是你正在查看的此页面的 <code>$page</code> 对象：</p>\n\x3c!--beforebegin--\x3e<div class="language-json extra-class">\x3c!--afterbegin--\x3e<pre v-pre class="language-json"><code><span class="token punctuation">{</span>\n  <span class="token property">"lastUpdated"</span><span class="token operator">:</span> <span class="token number">1524847549000</span><span class="token punctuation">,</span>\n  <span class="token property">"path"</span><span class="token operator">:</span> <span class="token string">"/guide/custom-themes.html"</span><span class="token punctuation">,</span>\n  <span class="token property">"title"</span><span class="token operator">:</span> <span class="token string">"自定义主题"</span><span class="token punctuation">,</span>\n  <span class="token property">"headers"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token comment">/* ... */</span><span class="token punctuation">]</span><span class="token punctuation">,</span>\n  <span class="token property">"frontmatter"</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n<span class="token punctuation">}</span>\n</code></pre>\n\x3c!--beforeend--\x3e</div>\x3c!--afterend--\x3e<p>如果用户在 <code>.vuepress/config.js</code> 中提供 <code>themeConfig</code>，它也可以用 <code>$site.themeConfig</code>。你可以使用它来允许用户自定义主题的行为 - 例如，指定类别和页面顺序。然后，你可以将这些数据与 <code>$site.pages</code> 一起使用来动态构建导航链接。</p>\n<p>最后，别忘了 <code>this.$route</code> 和 <code>this.$router</code> 也可作为 Vue Router API 的一部分。</p>\n<div class="tip custom-block"><p 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custom-block"><p class="custom-block-title">提示</p>\n<p>主题组件受到同样的 <router-link to="./using-vue.html#浏览器的-api-访问限制">浏览器的 API 访问限制</router-link>。</p>\n</div>\n<p>VuePress 使用单文件组件来构建自定义主题。想要开发一个自定义主题，首先在你的文档根目录新建一个 <code>.vuepress/theme</code> 文件夹，然后再创建一个 <code>Layout.vue</code> 文件：</p>\n\x3c!--beforebegin--\x3e<div class="language- extra-class">\x3c!--afterbegin--\x3e<pre v-pre class="language-text"><code>.\n└─ .vuepress\n   └─ theme\n      └─ Layout.vue\n</code></pre>\n\x3c!--beforeend--\x3e</div>\x3c!--afterend--\x3e<p>从这里开始，就和开发一个平时的 Vue 应用一样了，如何组织你的主题完全取决于你。</p>\n<h2 id="网站和页面的元数据"><a class="header-anchor" href="#网站和页面的元数据" aria-hidden="true">#</a> 网站和页面的元数据</h2>\n<p><code>Layout</code> 组件将会对每一个文档目录下的 <code>.md</code> 执行一次，同时，整个网站以及特定页面的元数据将分别暴露为 <code>this.$site</code> 和 <code>this.$page</code> 属性，它们将会被注入到每一个当前应用的组件中。</p>\n<p>这是你现在看到的这个网站的 <code>$site</code> 的值：</p>\n\x3c!--beforebegin--\x3e<div class="language-json extra-class">\x3c!--afterbegin--\x3e<pre v-pre class="language-json"><code><span class="token punctuation">{</span>\n  <span class="token property">"title"</span><span class="token operator">:</span> <span class="token string">"VuePress"</span><span class="token punctuation">,</span>\n  <span class="token property">"description"</span><span class="token operator">:</span> <span class="token string">"Vue 驱动的静态网站生成器"</span><span class="token punctuation">,</span>\n  <span class="token property">"base"</span><span class="token operator">:</span> <span class="token string">"/"</span><span class="token punctuation">,</span>\n  <span class="token property">"pages"</span><span class="token operator">:</span> <span class="token punctuation">[</span>\n    <span class="token punctuation">{</span>\n      <span class="token property">"lastUpdated"</span><span class="token operator">:</span> <span class="token number">1524027677000</span><span class="token punctuation">,</span>\n      <span class="token property">"path"</span><span class="token operator">:</span> <span class="token string">"/"</span><span class="token punctuation">,</span>\n      <span class="token property">"title"</span><span class="token operator">:</span> <span class="token string">"VuePress"</span><span class="token punctuation">,</span>\n      <span class="token property">"frontmatter"</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n    <span class="token punctuation">}</span><span class="token punctuation">,</span>\n    ...\n  <span class="token punctuation">]</span>\n<span class="token punctuation">}</span>\n</code></pre>\n\x3c!--beforeend--\x3e</div>\x3c!--afterend--\x3e<p><code>title</code>, <code>description</code> 和 <code>base</code> 会从 <code>.vuepress/config.js</code> 中对应的的字段复制过来，而 <code>pages</code> 是一个包含了每个页面元数据对象的数据，包括它的路径、页面标题（明确地通过 <router-link to="./markdown.html#front-matter">YAML front matter</router-link> 指定，或者通过该页面的第一个标题取到），以及所有源文件中的 <code>YAML front matter</code> 的数据。</p>\n<p>下面的这个对象是你正在看的这个页面的 <code>$page</code> 的值：</p>\n\x3c!--beforebegin--\x3e<div class="language-json extra-class">\x3c!--afterbegin--\x3e<pre v-pre class="language-json"><code><span class="token punctuation">{</span>\n  <span class="token property">"lastUpdated"</span><span class="token operator">:</span> <span class="token number">1524847549000</span><span class="token punctuation">,</span>\n  <span class="token property">"path"</span><span class="token operator">:</span> <span class="token string">"/custom-themes.html"</span><span class="token punctuation">,</span>\n  <span class="token property">"title"</span><span class="token operator">:</span> <span class="token string">"自定义主题"</span><span class="token punctuation">,</span>\n  <span class="token property">"headers"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token comment">/* ... */</span><span class="token punctuation">]</span><span class="token punctuation">,</span>\n  <span class="token property">"frontmatter"</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>\n<span class="token punctuation">}</span>\n</code></pre>\n\x3c!--beforeend--\x3e</div>\x3c!--afterend--\x3e<p>如果用户在 <code>.vuepress/config.js</code> 配置了 <code>themeConfig</code>，你将可以通过 <code>$site.themeConfig</code> 访问到它。如此一来，你可以通过它来对用户开放一些自定义主题的配置 —— 比如指定目录或者页面的顺序，你也可以结合 <code>$site.pages</code> 来动态地构建导航链接。</p>\n<p>最后，别忘了，作为 Vue Router API 的一部分，<code>this.$route</code> 和 <code>this.$router</code> 同样可以使用。</p>\n<div class="tip custom-block"><p class="custom-block-title">提示</p>\n<p><code>lastUpdated</code> 是这个文件最后一次 git 提交的 UNIX 时间戳，更多细节请参考：<router-link to="./../default-theme-config/#最后更新时间">最后更新时间</router-link>。</p>\n</div>\n<h2 id="内容摘抄"><a class="header-anchor" href="#内容摘抄" aria-hidden="true">#</a> 内容摘抄</h2>\n<p>如果一个 markdown 文件中有一个 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