和之间的区别是什么？和& amp; amp;在HTML5中？ [英] Whats the difference between & and & in HTML5?

问题描述

& 和& amp; ？

之间有什么区别
$ p

< a href = mailto：EMAIL？subject = BLABLABLA& body = http：// URL，SHORT DESCRIPTION>< / a> 
< a href =mailto：EMAIL？subject = BLABLABLA& amp; body = http：// URL，SHORT DESCRIPTION>< / a> 
  

解决方案

& amp; 是& 的html特殊字符，它对于html特殊字符具有特殊的含义。事实上， href =&的作品是大多数浏览器提供的便利，这些浏览器足以处理无效的HTML，但从技术上讲它是不正确的。您希望使用& amp; ，因为实体会在HTML代码中转换为& 。

考虑如果您使用而不是& 。会结束 href 值并使HTML不正确，对吗？您想使用& quot; p>

请参阅： http://www.w3.org/html/wg/drafts/html/master/single-page.html#syntax-errors 涉及脆弱语法结构的错误 - 事实上它指出使用& 是没有问题的，如果没有命名字符引用，但是有很多这样的引用;理想情况下，您会自动转义属性输入。

What is the difference between & and &?

Like in the code bellow, are both working in the same way?

<a href="mailto:EMAIL?subject=BLABLABLA&body=http://URL, SHORT DESCRIPTION"></a>
<a href="mailto:EMAIL?subject=BLABLABLA&amp;body=http://URL, SHORT DESCRIPTION"></a>

解决方案

& is the html special character for &, which has a special meaning as the sigial for html special characters. The fact that href="&" works is a convenience granted by most browsers who are nice enough to properly deal with invalid HTML, but it is technically incorrect. You want to use & because the entity will be converted into & in the HTML code.

Consider if you used " instead of &. That would end the href value and make the HTML incorrect, right? You want to use ".

See: http://www.w3.org/html/wg/drafts/html/master/single-page.html#syntax-errors "Errors involving fragile syntax constructs" -- in fact it points out that using & is okay if it's not followed by a named character reference, but there are many of those; ideally you would be escaping attribute input more or less automatically.

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