问题描述
我正在做一个项目，并且经常在therubyracer和libv8中遇到问题，所以我决定删除它们.似乎唯一将它们用作依赖项的是我想始终删除的较少的rails.
I was working on a project and was having issues with therubyracer and libv8 often, so i decided to remove them. It seemed to be the only thing that used them as a dependency was less-rails which I wanted to remove anyways.
我的主要问题是它们的用途是什么?在普通应用程序中我需要它们吗?如果是，为什么?
My main question is what are they for and do I need them in the average application and if so why?
推荐答案
Rails应用程序可能会在某些方面使用Javascript运行时:
There are a few things for which a Rails app might use a Javascript Runtime:
1)Rails 资产管道需要Javascript运行时才能执行Javascript压缩.
1) The Rails Asset Pipeline requires a Javascript Runtime in order to perform Javascript compression.
2)某些rails ActionView帮助器(例如javascript_include_tag)需要Javascript运行时才能执行Javascript函数.
2) Certain Rails ActionView Helpers like javascript_include_tag require a Javascript Runtime in order to execute Javascript functions.
并不是每个Rails应用程序都使用这些功能，因此，rubyracer gem最初在您的Gemfile中被注释掉的原因；此外请注意，您也可以将NodeJS用作Javascript运行时.
Not every Rails application use those features, hence the reason that therubyracer gem is initially commented out in your Gemfile; Furthermore note that you could alternatively use NodeJS as your Javascript runtime.
有关详细信息，请参见:
For details, see:
http://guides.rubyonrails.org/asset_pipeline.html#javascript-compression
http://www.rubydoc.info/docs/rails/ActionView/Helpers/JavaScriptHelper
http://www.rubydoc.info/docs/rails/ActionView％2FHelpers％2FAssetTagHelper％3Ajavascript_include_tag
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