脚本中的双连字符使firefox奇怪地呈现 [英] double hyphen in script makes firefox render strangely
问题描述
<！ - < script type =text / javascript> / *<！[CDATA [* / c--; //]]& ; / script> - >
当我在< head>部分的一个纯HTML页面，Firefox 3.5.5呈现尾随 - >作为文本。如果我改变c--到c-它不。任何想法在这里发生了什么？我在我的页面上有一个工件，因为一个非常大的脚本已经嘎吱嘎吱。我可以改变语句为c- = 1，避免现在的问题，但....我想知道什么位/字节咬我的a $$。
这是由于Firefox实现了SGML（基于HTML）。这将只会发生在文档以标准模式加载（即有一个DOCTYPE）。
第一个<！开始注释。第一个 - 输入允许使用> 字符的部分。第二个 - （在脚本中）留下允许使用> 字符的部分。 < / script> 结尾处的> 因此，以下 - > 不再是注释的一部分，并以文本形式呈现。
http://www.howtocreate.co.uk/SGMLComments.html 公开综合指南。
它还值得注意的是 HTML 4规范说，作者应避免在注释中插入两个或更多个连字符和 HTML 5规格说明注释不得包含两个连续的U + 002D HYPHEN-MINUS字符（ - ）'。 / p>
您发现的解决方案是在注释中不包括 - 。 / p>
<!-- <script type="text/javascript">/*<![CDATA[*/ c-- ;//]]></script> -->
When I have the above line in the <head> section of a plain html page, Firefox 3.5.5 renders the trailing --> as text. If I change c-- to c- it doesn't. Any ideas what's going on here? I getting an artifact on my pages with this due to a very large script that's been crunched. I can change the statement to c-=1 and avoid the problem for now but.... I'd like to know what bit/byte is biting my a$$.
This is due to Firefox implementing SGML (on which HTML was based) comments strictly. This will only occur when the document is loaded in standards mode (i.e. there is a DOCTYPE).
The first <! starts a comment. The first -- enters a section in which > characters are allowed. The second -- (in your script) leaves the section in which > characters are allowed. The > at the end of </script> then ends the comment. The following --> is therefore no longer part of the the comment and gets rendered as text.
See http://www.howtocreate.co.uk/SGMLComments.html for a fairly comprehensive guide to the issue.
Its also worth noting that the HTML 4 Specification says that 'authors should avoid putting two or more adjacent hyphens inside comments' and the HTML 5 Specification says comments must not 'contain two consecutive U+002D HYPHEN-MINUS characters (--)'.
The solution, as you've found, is to not include -- in the middle of a comment.
这篇关于脚本中的双连字符使firefox奇怪地呈现的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
