There's a strip_tags method in ActionView::Helpers::SanitizeHelper
http://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-strip_tags
继续自问自答
预编译需要带条件 rake assets:precompile RAILS_ENV=production
自问自答
确实是因为 turbolinks 引起的
之后解决方案参看http://stackoverflow.com/questions/18770517/rails-4-how-to-use-document-ready-with-turbo-links