我更喜欢使用lodash的大多数事情，所以这里有一个解决方案:

function getExtensionFromFilename(filename) {
    let extension = '';
    if (filename > '') {
        let parts = _.split(filename, '.');
        if (parts.length >= 2) {
        extension = _.last(parts);
    }
    return extension;
}

在path模块中有一个标准库函数:

import path from 'path';

console.log(path.extname('abc.txt'));

输出:

. txt

所以，如果你只想要格式:

path.extname('abc.txt').slice(1) // 'txt'

如果没有扩展名，函数将返回一个空字符串:

path.extname('abc') // ''

如果使用Node，则path是内置的。如果你的目标是浏览器，那么Webpack将为你捆绑一个路径实现。如果你的目标浏览器没有Webpack，那么你可以手动包含path-browserify。

没有理由进行字符串分割或正则表达式。

function file_get_ext(filename)
    {
    return typeof filename != "undefined" ? filename.substring(filename.lastIndexOf(".")+1, filename.length).toLowerCase() : false;
    }

function func() {
  var val = document.frm.filename.value;
  var arr = val.split(".");
  alert(arr[arr.length - 1]);
  var arr1 = val.split("\\");
  alert(arr1[arr1.length - 2]);
  if (arr[1] == "gif" || arr[1] == "bmp" || arr[1] == "jpeg") {
    alert("this is an image file ");
  } else {
    alert("this is not an image file");
  }
}

简单的方法获得文件名甚至多个点在名称

var filename = "my.filehere.txt";

file_name =  filename.replace('.'+filename.split('.').pop(),'');

console.log("Filename =>"+file_name);

输出:my.filehere

extension = filename.split('.').pop();
console.log("Extension =>"+extension);

输出:txt

试试这是一行代码

Code

/**
 * Extract file extension from URL.
 * @param {String} url
 * @returns {String} File extension or empty string if no extension is present.
 */
var getFileExtension = function (url) {
    "use strict";
    if (url === null) {
        return "";
    }
    var index = url.lastIndexOf("/");
    if (index !== -1) {
        url = url.substring(index + 1); // Keep path without its segments
    }
    index = url.indexOf("?");
    if (index !== -1) {
        url = url.substring(0, index); // Remove query
    }
    index = url.indexOf("#");
    if (index !== -1) {
        url = url.substring(0, index); // Remove fragment
    }
    index = url.lastIndexOf(".");
    return index !== -1
        ? url.substring(index + 1) // Only keep file extension
        : ""; // No extension found
};

Test

注意，在没有查询的情况下，片段可能仍然存在。

"https://www.example.com:8080/segment1/segment2/page.html?foo=bar#fragment" --> "html"
"https://www.example.com:8080/segment1/segment2/page.html#fragment"         --> "html"
"https://www.example.com:8080/segment1/segment2/.htaccess?foo=bar#fragment" --> "htaccess"
"https://www.example.com:8080/segment1/segment2/page?foo=bar#fragment"      --> ""
"https://www.example.com:8080/segment1/segment2/?foo=bar#fragment"          --> ""
""                                                                          --> ""
null                                                                        --> ""
"a.b.c.d"                                                                   --> "d"
".a.b"                                                                      --> "b"
".a.b."                                                                     --> ""
"a...b"                                                                     --> "b"
"..."                                                                       --> ""

JSLint

0的警告。