Javascript 如何使用javascript更改文件扩展名
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How do I change file extension with javascript
提问by JLuiz
Does anyone know an easy way to change a file extension in Javascript?
有谁知道在 Javascript 中更改文件扩展名的简单方法？
For example, I have a variable with "first.docx" but I need to change it to "first.html".
例如，我有一个带有“first.docx”的变量，但我需要将其更改为“first.html”。
回答by Alex K.
This will change the string containingthe file name;
这将更改包含文件名的字符串；
file = file.substr(0, file.lastIndexOf(".")) + ".htm";
For situations where there may not be an extension:
对于可能没有扩展名的情况：
var pos = file.lastIndexOf(".");
file = file.substr(0, pos < 0 ? file.length : pos) + ".htm";
回答by ChaosPandion
file = file.replace(/\.[^.]+$/, '.html');
回答by emlai
In Node.js:
在 Node.js 中：
path.join(path.dirname(file), path.basename(file, path.extname(file)) + '.html')
This works also if the file doesn't have an extension and one of the parent directories has a dot in the name.
如果文件没有扩展名并且父目录之一的名称中有一个点，这也适用。
回答by Merc
This probably won't get many upvotes but I couldn't resist.
这可能不会得到很多赞成，但我无法抗拒。
This code will deal with the edge case where a file might not have an extension already (in which case it will add it). It uses the "tilde trick"
此代码将处理文件可能还没有扩展名的边缘情况（在这种情况下它将添加它）。它使用“波浪号技巧”
function changeExt (fileName, newExt) {
var _tmp
return fileName.substr(0, ~(_tmp = fileName.lastIndexOf('.')) ? _tmp : fileName.length) + '.' + newExt
}
回答by mizkichan
I'd use this:
我会用这个：
path.format({ ...path.parse('/foo/bar/baz.hoge'), base: undefined, ext: '.fuga' })
回答by Maxime
var file = "first.docx";
file = file.split(".");
file = file[0]+".html";
