在字符串中转义反斜杠 - javascript [英] Escaping backslash in string - javascript

问题描述

我需要显示当前所选文件的名称（在< input type =file> 元素中）。

I need to show the name of the currently selected file (in <input type="file"> element).

一切都很好，唯一的问题是我得到这种字符串C：\fakepath
\typog_rules.pdf（自动浏览将此作为输入元素的值）。

Everything is fine, the only problem is I'm getting this kind of string "C:\fakepath \typog_rules.pdf" (browset automatically puts this as value for the input element).

当我尝试将字符串拆分为'\'或'\\'由于未转义的斜杠而失败。匹配/替换斜杠的尝试也失败。有没有解决的办法？我需要这样工作至少在Opera和IE（因为在其他浏览器我可以使用FileReader）

When I try to split the string by '\' or '\\' it fails because of unescaped slashes. Attempts to match/replace slashes fails too. Is there a way around this? I need this to work at least in Opera and IE (because in other browsers I can use FileReader)

E.G。我得到C：\fakepath\typog_rules.pdf作为输入，并希望得到typog_rules.pdf作为输出。

E.G. I'm getting "C:\fakepath\typog_rules.pdf" as input and want to get "typog_rules.pdf" as output.

推荐答案

出于安全考虑，不可能通过< input type =file/> 元素。

For security reasons, it is not possible to get the real, full path of a file, referred through an <input type="file" /> element.

此问题已经提及，并链接到有关此主题的其他Stack Overflow问题。

This question already mentions, and links to other Stack Overflow questions regarding this topic.

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反斜杠必须转义。

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The backslash has to be escaped.

string = string.split("\\");

在JavaScript中，反斜杠用于转义特殊字符，如换行符（ \\\
）。如果要使用文字反斜杠，则必须使用双反斜杠。

In JavaScript, the backslash is used to escape special characters, such as newlines (\n). If you want to use a literal backslash, a double backslash has to be used.

因此，如果要匹配两个反斜杠，则必须使用四个反斜杠。例如， alert（\\\\\）将显示一个包含两个反斜杠的对话框。

So, if you want to match two backslashes, four backslashes has to be used. For example,alert("\\\\") will show a dialog containing two backslashes.

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