等价于 raw.

来自 Ruby on Rails 指南:

要逐字插入内容，请使用 raw 帮助器，而不是调用html_safe:

To insert something verbatim use the raw helper rather than calling html_safe:

<%= raw @cms.current_template %> <%# inserts @cms.current_template as is %>

或者，等效地，使用 :

or, equivalently, use <%==:

<%== @cms.current_template %> <%# inserts @cms.current_template as is %>