html - 在 中使用 "&"

Question

目前，我有:

<a href="process.php?action=start&pid=1">Start Process</a>

但是，我通过 W3 HTML 验证器 ( https://validator.w3.org ) 运行这段代码，结果如下:

& did not start a character reference. (& probably should have been escaped as &.)

是否有另一种正确的方法将“&”放入 <a></a> 中？标记，还是我应该保持原样？

Answer 1

处理 URL 中的符号 (&) 在 Web Design Group 中有解释。的 Common Validator Problems page :

Ampersands (&'s) in URLs

Another common error occurs when including a URL which contains an ampersand ("&"):

<!-- This is invalid! --> <a href="foo.cgi?chapter=1&section=2&copy=3&lang=en">...</a>

This example generates an error for "unknown entity section" because the "&" is assumed to begin an entity reference. Browsers often recover safely from this kind of error, but real problems do occur in some cases. In this example, many browsers correctly convert &copy=3 to ©=3, which may cause the link to fail. Since ⟨ is the HTML entity for the left-pointing angle bracket, some browsers also convert &lang=en to 〈=en. And one old browser even finds the entity §, converting &section=2 to §ion=2.

To avoid problems with both validators and browsers, always use & in place of & when writing URLs in HTML:

<a href="foo.cgi?chapter=1&amp;section=2&amp;copy=3&amp;lang=en">...</a>

Note that replacing & with & is only done when writing the URL in HTML, where "&" is a special character (along with "<" and ">"). When writing the same URL in a plain text email message or in the location bar of your browser, you would use "&" and not "&". With HTML, the browser translates "&" to "&" so the Web server would only see "&" and not "&" in the query string of the request.