转义字符串中的反斜杠 - javascript
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Escaping backslash in string - javascript
提问by Max
I need to show the name of the currently selected file (in <input type="file">element).
我需要显示当前选定文件的名称（在<input type="file">元素中）。
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).
一切都很好，唯一的问题是我得到了这种字符串“C:\fakepath\typog_rules.pdf”（浏览器自动将其作为输入元素的值）。
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)
当我尝试拆分字符串时，'\'或者'\\'由于未转义的斜杠而失败。尝试匹配/替换斜线也失败了。有没有解决的办法？我需要它至少在 Opera 和 IE 中工作（因为在其他浏览器中我可以使用 FileReader）
E.G. I'm getting "C:\fakepath\typog_rules.pdf" as input and want to get "typog_rules.pdf" as output.
EG 我得到“C:\fakepath\typog_rules.pdf”作为输入并希望得到“typog_rules.pdf”作为输出。
回答by Rob W
For security reasons, it is not possible to get the real, full path of a file, referred through an <input type="file" />element.
出于安全原因，不可能获得通过<input type="file" />元素引用的文件的真实完整路径。
This questionalready mentions, and links to other Stack Overflow questions regarding this topic.
这个问题已经提到，并链接到关于这个主题的其他 Stack Overflow 问题。
Previous answer, kept as a reference for future visitors who reach this page through the title, tags and question.以前的答案，作为通过标题、标签和问题访问此页面的未来访问者的参考。
必须转义反斜杠。
string = string.split("\");
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.
在 JavaScript 中，反斜杠用于转义特殊字符，例如换行符 ( \n)。如果要使用文字反斜杠，则必须使用双反斜杠。
So, if you want to match two backslashes, four backslashes has to be used. For example,alert("\\\\")will show a dialog containing two backslashes.
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。
回答by Himerzi
I think this is closer to the answer you're looking for:
我认为这更接近您正在寻找的答案：
<input type="file">
$file = $(file);
var filename = fileElement[0].files[0].name;
回答by Quentin
Escape the backslash character.
转义反斜杠字符。
foo.split('\')
回答by Yifat Biezuner
Add an input id to the element and do something like that:
向元素添加输入 id 并执行以下操作：
document.getElementById('inputId').value.split(/[\$]/).pop()
回答by Ashley Williams
Slightly hacky, but it works:
有点hacky，但它有效：
const input = '\text';
const output = JSON.stringify(input).replace(/((^")|("$))/g, "").trim();
console.log({ input, output });
// { input: '\text', output: '\text' }