嵌入红宝石“ erb”标签 [英] Embedded ruby "erb" tags

问题描述

我一直在经历Ruby和Ruby on Rails的速成课程，但我无法弄清楚：
在嵌入式ruby html文件中，有几个标签。
<％％>用于执行
<％=％>用于输出，但是这些标记提供什么功能：<％=-％>，最后带有-符号

I have been going through a crash course of Ruby and Ruby on Rails and i can't figure this out: In embedded ruby html files, there are several tags. <% %> for execution <%= %> for output, but what function do these tags serve: <%= -%>, what's with the "-" sign at the end ?

谢谢。

推荐答案

此链接很好地概述了erb标记。

This link contains a good overview of erb markup.

来自站点：

已识别标签

RECOGNIZED TAGS

ERB识别提供的模板中的某些标签，并根据以下规则将它们转换为

：

ERB recognizes certain tags in the provided template and converts
them based on the rules below:

<% Ruby code -- inline with output %>

<%= Ruby expression -- replace with result %>

<%# comment -- ignored -- useful in testing %>

% a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)

%% replaced with % if first thing on a line and % processing is used

<%% or %%> -- replace with <% or %> respectively

所有其他文本均通过ERB过滤而保持不变。

All other text is passed through ERB filtering unchanged.

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