如何使用JavaScript获取文件扩展名？ [英] How can I get file extensions with JavaScript?

问题描述

参见代码：

var file1 = "50.xsl";
var file2 = "30.doc";
getFileExtension(file1); //returns xsl
getFileExtension(file2); //returns doc

function getFileExtension(filename) {
    /*TODO*/
}

推荐答案

更新编辑：自从这个问题最初发布以来，很多事情都发生了变化 - 有很多非常好的信息在 wallacer的修订答案以及 VisioN的优秀分类

Newer Lots of things have changed since this question was initially posted - there's a lot of really good information in wallacer's revised answer as well as VisioN's excellent breakdown

编辑：因为这是接受的答案; wallacer的回答确实要好得多：

Just because this is the accepted answer; wallacer's answer is indeed much better:

return filename.split('.').pop();

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我的回答是：

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My old answer:

return /[^.]+$/.exec(filename);

应该这样做。

编辑：为了回应PhiLho的评论，请使用以下内容：

In response to PhiLho's comment, use something like:

return (/[.]/.exec(filename)) ? /[^.]+$/.exec(filename) : undefined;

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