Function getUrlFileType

EN: Get the file type of the url.

ZH: 获取文件后缀名

Usage:

const ret1 = getUrlFileType('https://example.com/a/b/c.png');
const ret2 = getUrlFileType('https://example.com/a/b/c.jpg');
const ret3 = getUrlFileType('https://example.com/a/b/c.jpeg');
const ret4 = getUrlFileType('/a/b/c.jpeg');
const ret5 = getUrlFileType('https://example.com/a/b/c.v/a');
console.log(ret1, ret2, ret3, ret4, ret5);
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Output:

png jpg jpeg jpeg ''
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