blocks|key|2196690|text|转义HTML只是意味着对它进行编码，使它看起来像HTML，所以您可以看到foo，而不是像foo那样在页面上实际上被当作HTML对待。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2196691|其方法是将特殊字符转换为称为HTML实体的安全版本。例如，<的HTML实体是&gt;。|2196692|entityMap^0|10|A|1F|3|0|T|1|12|4|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]|$9|N|A|O|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|E|@]|F|$]]|$1|I|3|-4|5|6|7|U|8|@]|E|@]|F|$]]]|J|$]]

Escaping HTML just means encoding it so it shows up looking like HTML, so you see <code>&lt;b&gt;foo&lt;/b&gt;</code> instead of actually being treated as HTML on your page, like foo.

The way it does this is by converting special characters into safe versions called HTML entities. For example, the HTML entity for <code>&lt;</code> is <code>&amp;gt;</code>.

blocks|key|2196716|text|如果post.name+=+Bob|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2196717|然后转义的HTML将显示|2196718|Bob|2196719|而未转义的HTML将显示原始输出|2196720|Bob|BOLD|2196721|entityMap^0|E|A|0|0|0|A|0|0|0|3|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|X|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|Y|8|@$9|Z|A|10|B|N]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|P|$]]

If post.name = <code>&lt;b&gt;Bob&lt;/b&gt;</code>

then Escaped HTML will show 

<code>&lt;b&gt;Bob&lt;/b&gt;</code>

While Unescaped HTML will show raw output

Bob

blocks|key|2196746|text|Html转义对于保护rails应用程序通过跨站点脚本非常重要。为了更好地理解跨站点脚本，请通过这个最初的屏幕。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2196747|http://railscasts.com/episodes/27-cross-site-scripting|offset|length|2196748|有关在Rails+3中如何处理此问题的更多信息。|2196749|http://railscasts.com/episodes/204-xss-protection-in-rails-3|2196750|我建议深入研究这篇关于保护Rails应用程序的指南，该指南讨论了很多事情。|2196751|http://guides.rubyonrails.org/v2.3.8/security.html|2196752|entityMap|0|LINK|mutability|MUTABLE|url|1|2^0|0|0|1I|0|0|0|0|1O|1|0|0|0|1E|2|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|N|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|C]]|U|$5|Q|R|S|A|$T|I]]|V|$5|Q|R|S|A|$T|M]]]]

Html escaping is important for securing rails application over cross site scripting. To better understand cross-site scripting please go through this initial screencast.

<a href="http://railscasts.com/episodes/27-cross-site-scripting" rel="nofollow">http://railscasts.com/episodes/27-cross-site-scripting</a>

For further info about how this is handled in Rails 3

<a href="http://railscasts.com/episodes/204-xss-protection-in-rails-3" rel="nofollow">http://railscasts.com/episodes/204-xss-protection-in-rails-3</a>

I would suggest to go thorough this guide about securing Rails Applications which talks about whole lot of things.

<a href="http://guides.rubyonrails.org/v2.3.8/security.html" rel="nofollow">http://guides.rubyonrails.org/v2.3.8/security.html</a>

I've been following the Rails 3 Getting Started guide and there was this note in the guide that I didn't understand:

<blockquote>
 In previous versions of Rails, you had to use <code>&lt;%=h post.name %&gt;</code> so
 that any HTML would be escaped before being inserted into the page. In
 Rails 3.0, this is now the default. To get unescaped HTML, you now use
 <code>&lt;%= raw post.name %&gt;</code>.
</blockquote>

I don't really get what it means by escaped HTML vs unescaped HTML. Can someone explain this to me?

Thanks!

Rails getting started help

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我一直在遵循Rails 3入门指南，指南中有一条我不明白的注释：在早期版本的Rails中，您必须使用<%=h post.name %>，以便在插入到页面之前对任何HTML进行转义。在Rails 3.0中，这是默认的。要获得未转义的HTML，现在可以使用<%= raw post.name %>。我不太明白转义HTML和未...

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