Node.js path.extname()方法
原文:https://www.geeksforgeeks.org/node-js-path-extname-method/
path.extname()方法用于获取文件路径的扩展名部分。从句点(.)的最后一次出现返回的扩展字符串。)放在路径字符串的末尾。如果文件路径中没有句点，则返回一个空字符串。
语法:
path.extname( path )
参数:该方法接受单参数路径，该路径保存用于提取扩展名的文件路径。
返回值:返回一个带有路径扩展部分的字符串。如果此参数不是字符串值，它将引发类型错误。
下面的例子说明了 node.js 中的 path.extname()方法:
例 1:
// Node.js program to demonstrate the
// path.extname() method
// Import the path module
const path = require('path');
path1 = path.extname("hello.txt");
console.log(path1)
path2 = path.extname("readme.md");
console.log(path2)
// File with no extension
// Returns empty string
path3 = path.extname("fileDump")
console.log(path3)
// File with blank extension
// Return only the period
path4 = path.extname("example.")
console.log(path4)
path5 = path.extname("readme.md.txt")
console.log(path5)
// Extension name of the current script
path6 = path.extname(__filename)
console.log(path6)
输出:
.txt
.md
.
.txt
.js
例 2:
// Node.js program to demonstrate the
// path.extname() method
// Import the path module
const path = require('path');
// Comparing extensions from a
// list of file paths
paths_array = [
"/home/user/website/index.html",
"/home/user/website/style.css",
"/home/user/website/bootstrap.css",
"/home/user/website/main.js",
"/home/user/website/contact_us.html",
"/home/user/website/services.html",
]
paths_array.forEach(filePath => {
if (path.extname(filePath) == ".html")
console.log(filePath);
});
输出:
/home/user/website/index.html
/home/user/website/contact_us.html
/home/user/website/services.html
参考:T2】https://nodejs.org/api/path.html#path_path_extname_path
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