环境(Environments)
In the build
(or serve
) arguments, you can specify a Jekyll environment
and value. The build will then apply this value in any conditional statements
in your content.
For example, suppose you set this conditional statement in your code:
{% if jekyll.environment == "production" %}
{% include disqus.html %}
{% endif %}
When you build your Jekyll site, the content inside the if
statement won’t be
run unless you also specify a production
environment in the build command,
like this:
JEKYLL_ENV=production jekyll build
Specifying an environment value allows you to make certain content available only within specific environments.
The default value for JEKYLL_ENV
is development
. Therefore if you omit
JEKYLL_ENV
from the build arguments, the default value will be
JEKYLL_ENV=development
. Any content inside
{% if jekyll.environment == "development" %}
tags will
automatically appear in the build.
Your environment values can be anything you want (not just development
or
production
). Some elements you might want to hide in development
environments include Disqus comment forms or Google Analytics. Conversely,
you might want to expose an “Edit me in GitHub” button in a development
environment but not include it in production environments.
By specifying the option in the build command, you avoid having to change values in your configuration files when moving from one environment to another.
To switch part of your config settings depending on the environment, use the
build command option,
for example --config _config.yml,_config_development.yml
. Settings
in later files override settings in earlier files.