JavaScript 和字符串中的正斜杠
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JavaScript and forward slashes in strings
提问by rubixibuc
What is the real reason that we must escape a forward slash in a JavaScript string, and also why must we escape string/no string in XHTML. A lot of tutorials just brush over this issue.
我们必须在 JavaScript 字符串中转义正斜杠的真正原因是什么，以及为什么我们必须在 XHTML 中转义字符串/无字符串。很多教程只是刷过这个问题。
回答by Quentin
What is the real reason that we must escape a forward slash in a JavaScript string
我们必须在 JavaScript 字符串中转义正斜杠的真正原因是什么？
In an HTML 4 document, the sequence </inside an element defined as containing CDATA (such as script) is an end tag and will end the element (with an error if it is not </script>.
在 HTML 4 文档中，</定义为包含 CDATA（例如脚本）的元素内的序列是结束标记，并将结束该元素（如果不是</script>.
As far as JS is concerned /and \/are identical inside a string. As far as HTML is concerned </starts an end tag but <\/does not.
就 JS 而言/，\/在字符串中是相同的。就 HTML 而言，</开始一个结束标记，但<\/没有。
, and also why must we escape string/no string in XHTML.
，以及为什么我们必须在 XHTML 中转义字符串/无字符串。
XHTML doesn't provide a method of specifying that an element intrinsically contains CDATA, so you need to explicitly handle characters which would otherwise have special meaning (<, &, etc). Wrapping the contents of the element with CDATA markers is the easiest way to achieve this.
XHTML不提供指定的元素本质上包含CDATA的方法，所以你需要明确地处理，否则有特殊含义（字符<，&等等）。使用 CDATA 标记包装元素的内容是实现此目的的最简单方法。
回答by rid
You don't need to escape /in a JavaScript string, just \, because if you don't, then the string yes\nowill inadvertently be transformed into yes<newline>o. Escaping the \will prevent that.
您不需要/在 JavaScript 字符串中转义，只需\，因为如果您不这样做，那么该字符串yes\no将在不经意间转换为yes<newline>o. 逃避\意志可以阻止这种情况。
Also, if you don't escape &in a URL, then whatever comes after it will be considered a new parameter. For example, a=Q&Awill mean "the parameter ahas the value "Q" and there's also a parameter A" instead of "the parameter ahas the value "Q&A"". The correct way of escaping that would be a=Q%26A.
此外，如果您不在&URL 中转义，那么后面的任何内容都将被视为新参数。例如，a=Q&A将意味着“参数a具有值“ Q”并且还有一个参数A“而不是“参数a具有值” Q&A“”。逃避的正确方法是a=Q%26A.
回答by densho
The slash is needed to prevent browsers, particularly older ones, to erroneously interpret the forward slash as a closing JavaScript marker.
需要使用斜杠来防止浏览器，尤其是较旧的浏览器，将正斜杠错误地解释为结束 JavaScript 标记。
