变量(Variables)

Jekyll traverses your site looking for files to process. Any files with front matter are subject to processing. For each of these files, Jekyll makes a variety of data available via Liquid. The following is a reference of the available data.

Global Variables

变量	说明
`site`	Site wide information + configuration settings from `_config.yml`. See below for details.
`page`	Page specific information + the front matter. Custom variables set via the front matter will be available here. See below for details.
`layout`	Layout specific information + the front matter. Custom variables set via front matter in layouts will be available here.
`theme`	Theme-gem specific information as defined in the theme's gemspec. Useful for rendering information in the theme demo's "About" page, for example. See below for details.
`content`	In layout files, the rendered content of the Post or Page being wrapped. Not defined in Post or Page files.
`paginator`	When the `paginate` configuration option is set, this variable becomes available for use. See Pagination for details.

Site Variables

变量	说明
`site.time`	The current time (when you run the `jekyll` command).
`site.pages`	A list of all Pages.
`site.posts`	A reverse chronological list of all Posts.
`site.related_posts`	If the page being processed is a Post, this contains a list of up to ten related Posts. By default, these are the ten most recent posts. For high quality but slow to compute results, run the `jekyll` command with the `--lsi` (latent semantic indexing) option. Also note GitHub Pages does not support the `lsi` option when generating sites.
`site.static_files`	A list of all static files (i.e. files not processed by Jekyll's converters or the Liquid renderer). Each file has five properties: `path`, `modified_time`, `name`, `basename` and `extname`.
`site.html_pages`	A subset of `site.pages` listing those which end in `.html`.
`site.html_files`	A subset of `site.static_files` listing those which end in `.html`.
`site.collections`	A list of all the collections (including posts).
`site.data`	A list containing the data loaded from the YAML files located in the `_data` directory.
`site.documents`	A list of all the documents in every collection.
`site.categories.CATEGORY`	The list of all Posts in category `CATEGORY`.
`site.tags.TAG`	The list of all Posts with tag `TAG`.
`site.url`	Contains the url of your site as it is configured in the `_config.yml`. For example, if you have `url: http://mysite.com` in your configuration file, then it will be accessible in Liquid as `site.url`. For the development environment there is an exception, if you are running `jekyll serve` in a development environment `site.url` will be set to the value of `host`, `port`, and SSL-related options. This defaults to `url: http://localhost:4000`.
`site.[CONFIGURATION_DATA]`	All the variables set via the command line and your `_config.yml` are available through the `site` variable. For example, if you have `foo: bar` in your configuration file, then it will be accessible in Liquid as `site.foo`. Jekyll does not parse changes to `_config.yml` in `watch` mode, you must restart Jekyll to see changes to variables.

Page Variables

变量	说明
`page.content`	The content of the Page, rendered or un-rendered depending upon what Liquid is being processed and what `page` is.
`page.title`	The title of the Page.
`page.excerpt`	The un-rendered excerpt of a document.
`page.url`	The URL of the Post without the domain, but with a leading slash, e.g. `/2008/12/14/my-post.html`
`page.date`	The Date assigned to the Post. This can be overridden in a Post’s front matter by specifying a new date/time in the format `YYYY-MM-DD HH:MM:SS` (assuming UTC), or `YYYY-MM-DD HH:MM:SS +/-TTTT` (to specify a time zone using an offset from UTC. e.g. `2008-12-14 10:30:00 +0900`).
`page.id`	An identifier unique to a document in a Collection or a Post (useful in RSS feeds). e.g. `/2008/12/14/my-post/my-collection/my-document`
`page.categories`	The list of categories to which this post belongs. Categories are derived from the directory structure above the `_posts` directory. For example, a post at `/work/code/_posts/2008-12-24-closures.md` would have this field set to `['work', 'code']`. These can also be specified in the front matter.
`page.collection`	The label of the collection to which this document belongs. e.g. `posts` for a post, or `puppies` for a document at path `_puppies/rover.md`. If not part of a collection, an empty string is returned.
`page.tags`	The list of tags to which this post belongs. These can be specified in the front matter.
`page.dir`	The path between the source directory and the file of the post or page, e.g. `/pages/`. This can be overridden by `permalink` in the front matter.
`page.name`	The filename of the post or page, e.g. `about.md`
`page.path`	The path to the raw post or page. Example usage: Linking back to the page or post’s source on GitHub. This can be overridden in the front matter.
`page.next`	The next post relative to the position of the current post in `site.posts`. Returns `nil` for the last entry.
`page.previous`	The previous post relative to the position of the current post in `site.posts`. Returns `nil` for the first entry.

ProTip™: Use Custom Front Matter

Any custom front matter that you specify will be available under page. For example, if you specify custom_css: true in a page’s front matter, that value will be available as page.custom_css.

If you specify front matter in a layout, access that via layout. For example, if you specify class: full_page in a layout’s front matter, that value will be available as layout.class in the layout and its parents.

Theme Variables4.3.0

变量	说明
`theme.root`	Absolute path to the theme-gem.
`theme.authors`	Comma separated string composed of the authors of the theme-gem.
`theme.description`	Description or summary of the theme-gem as specified in the theme gemspec.
`theme.version`	The version string of current theme.
`theme.dependencies`	List of runtime dependencies of the theme.
`theme.metadata`	A mapping of key-value pairs as defined in the theme gemspec.

Paginator

变量	说明
`paginator.page`	The number of the current page
`paginator.per_page`	Number of posts per page
`paginator.posts`	Posts available for the current page
`paginator.total_posts`	Total number of posts
`paginator.total_pages`	Total number of pages
`paginator.previous_page`	The number of the previous page, or `nil` if no previous page exists
`paginator.previous_page_path`	The path to the previous page, or `nil` if no previous page exists
`paginator.next_page`	The number of the next page, or `nil` if no subsequent page exists
`paginator.next_page_path`	The path to the next page, or `nil` if no subsequent page exists

Paginator variable availability

These are only available in index files, however they can be located in a subdirectory, such as /blog/index.html.