什么是& amp用于 [英] What is &amp used for

问题描述

我不知道为什么& amp; 插入，它有什么区别？

  www.testurl.com/test?param1=test&current=true 
  

与

  www.testurl.com/test?param1=test&current=true 
  

解决方案

& 是开始字符引用的HTML。 code>& amp; 是和号的字符引用。

& current ; 不是一个标准的字符引用，所以是一个错误（浏览器可能会尝试执行错误恢复，但不应该依赖于此）。

如果您使用字符引用来表示真实字符（例如& trade; ），那么它（™）将出现在URL中，而不是您想要的字符串。 / p>

（注意取决于HT的版本您使用的ML，您可能必须以; 结束字符引用，这就是为什么& trade = 会被视为&trade ;.如果下一个字符是非单词字符（例如 = ），但某些浏览器（Hello Internet Explorer）对此有问题，则HTML 4允许忽略它。 / p>

Is there any difference in behaviour of below URL.

I dont know why the & is inserted, does it make any difference ?

www.testurl.com/test?param1=test&current=true

versus

www.testurl.com/test?param1=test&current=true

解决方案

& is HTML for "Start of a character reference".

& is the character reference for "An ampersand".

&current; is not a standard character reference and so is an error (browsers may try to perform error recovery but you should not depend on this).

If you used a character reference for a real character (e.g. ™) then it (™) would appear in the URL instead of the string you wanted.

(Note that depending on the version of HTML you use, you may have to end a character reference with a ;, which is why &trade= will be treated as ™. HTML 4 allows it to be ommited if the next character is a non-word character (such as =) but some browsers (Hello Internet Explorer) have issues with this).

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