\对非转义字符做什么？ [英] what does \ do on non escape characters?

问题描述

我提出另一个问题，所以我会问别的。 p>

根据 http：// www .c-point.com / javascript_tutorial / special_characters.htm 有一些转义字符，如\\\
和\b。但是/不是其中之一。在这种情况下会发生什么？ （ \ / ）是被忽略的 \

我有一个字符串在javascript 'http：\ / \ / www.site.com\ / user'。不，这是一个文字，'所以使用它会像 \\\ \\ / 无论如何我想逃避这个字符串，所以关于非特殊的转义字符发生什么的问题。

另一个问题是如果我有名称：\t我（或名称：\\我是否有功能来逃避它，所以有一个选项卡？我使用C＃，这些字符串来自一个JSON文件

解决方案

根据Mozilla ：

对于未列出的字符[...]，前面的反斜杠将被忽略，但此用法已弃用，
应为避免。

https://developer.mozilla.org/en/JavaScript/Guide/Values%2c_Variables%2c_and_Literals#section_19

\ / 序列未列出，但至少有两个常用的用法：

< 1>需要使用正则表达式中的文字斜杠使用 / foo / 语法：

  var re = / ^ http：\ / \ //; 
  

< 2>在HTML中嵌入JavaScript代码时，需要避免无效的HTML：

 < script type =text / javascript><！ -  
 alert（'< / p> '）
 //  - >< / script> 
  

...触发器：未打开的元素P的结束标签

 < script type =text / javascript><！ -  
 alert < \ / p>'）
 //  - >< / script> 
  

...不。

I asked another question poorly so i'll ask something else.

According to http://www.c-point.com/javascript_tutorial/special_characters.htm there are a few escape characters such as \n and \b. However / is not one of them. What happens in this case? (\/) is the \ ignored?

I have a string in javascript 'http:\/\/www.site.com\/user'. Not that this is a literal with ' so with " it would look like \\/ anyways i would like to escape this string thus the question on what happens on non 'special' escape characters.

And another question is if i had name:\t me (or "name:\\t me" is there a function to escape it so there is a tab? i am using C# and these strings come from a JSON file

解决方案

According to Mozilla:

For characters not listed [...] a preceding backslash is ignored, but this usage is deprecated and should be avoided.

https://developer.mozilla.org/en/JavaScript/Guide/Values%2c_Variables%2c_and_Literals#section_19

The \/ sequence is not listed but there're at least two common usages:

<1> It's required to escape literal slashes in regular expressions that use the /foo/ syntax:

var re = /^http:\/\//;

<2> It's required to avoid invalid HTML when you embed JavaScript code inside HTML:

<script type="text/javascript"><!--
alert('</p>')
//--></script>

... triggers: end tag for element "P" which is not open

<script type="text/javascript"><!--
alert('<\/p>')
//--></script>

... doesn't.

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