获取文件后缀名的几种方式

PHP

使用strrpos，分割字符串

<?phpfunction suffix($name){    $index = strrpos($name,".");    return substr($name,$index,strlen($name)-$index);}echo suffix('koastal.png');

使用pathinfo，获取后缀名

<?phpfunction suffix($name){    return pathinfo($name,PATHINFO_EXTENSION);}echo suffix('koastal.png');

Node.js

lastIndexOf类似php中的strrpos

function suffix(name){    var index = name.lastIndexOf('.');    return name.substring(index);}var suffix = suffix('koastal.png');console.log(suffix);

path模块

const path = require('path');var suffix = path.extname('koastal.png');console.log(suffix);