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移除书签12. 拓展 Sass (Extending Sass)
Sass 提供了很多高级自定义功能，使用这些功能需要有良好的 Ruby 基础。
12.1. 自定义 Sass 函数 (Defining Custom Sass Functions)
通过 Ruby API 可以自定义 Sass 函数，具体请查看 source documentation。
12.2. 存储缓存 (Cache Stores)
Sass caches parsed documents so that they can be reused without parsing them again unless they have changed. By default, Sass will write these cache files to a location on the filesystem indicated by :cache_location. If you cannot write to the filesystem or need to share cache across ruby processes or machines, then you can define your own cache store and set the:cache_store option. For details on creating your own cache store, please see the source documentation.
12.3. 自定义导入 (Custom Importers)
Sass importers are in charge of taking paths passed to @import and finding the appropriate Sass code for those paths. By default, this code is loaded from the filesystem, but importers could be added to load from a database, over HTTP, or use a different file naming scheme than what Sass expects.
Each importer is in charge of a single load path (or whatever the corresponding notion is for the backend). Importers can be placed in the :load_paths array alongside normal filesystem paths.
When resolving an @import, Sass will go through the load paths looking for an importer that successfully imports the path. Once one is found, the imported file is used.
User-created importers must inherit from Sass::Importers::Base.
