NodeJS基础API-path相关的问题basename,extname,dirname,parse,f

path

参考文档：http://nodejs.cn/api/path.html

const {normalize} = require(‘path‘);  // ES6语法
// 相当于 const normalize = require(‘path‘).normalize;
 
// 标准化路径
 console.log(normalize(‘/usr///local/bin‘));
 console.log(normalize(‘/usr/local/../bin‘));

输入 node normalize.js，可以修正路径

/usr/local/bin
/usr/bin

路径拼接：

const {join} = require(‘path‘);
console.log(join(‘/usr/‘,‘local‘,‘bin‘))

/usr/local/bin

将相对路径转化为绝对路径：

const {resolve} = require(‘path‘);
console.log(resolve(‘./‘));

/home/dex/web/nodejs

basename,dirname,extname

const {basename,extname} = require(‘path‘);
const filePath = ‘/usr/local/bin/no.txt‘;

console.log(basename(filePath));
console.log(dirname(filePath));
console.log(extname(filePath));

no.txt
/usr/local/bin
.txt

parse与format

const {parse,format} = require(‘path‘);
const filePath = ‘/usr/local/node_modules/n/iloveu.json‘;
const ret = parse(filePath);
console.log(ret);
const path = format(ret);
console.log(path);

{ root: ‘/‘,
dir: ‘/usr/local/node_modules/n‘,
base: ‘iloveu.json‘,
ext: ‘.json‘,
name: ‘iloveu‘ }
/usr/local/node_modules/n/iloveu.json

与操作系统有关的一些 sep delimiter win32 posix

const {sep,delimiter,win32,posix} = require(‘path‘);
console.log(‘sep:‘,sep);
console.log(‘win sep:‘,win32.sep);
console.log(‘posix sep:‘,posix.sep);
console.log(‘PATH:‘,process.env.PATH);
console.log(‘delimiter:‘,delimiter);
console.log(‘win delimiter:‘,win32.delimiter);
console.log(‘posix delimiter:‘,posix.delimiter);

sep: /
win sep: posix sep: /
PATH: /home/dex/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
delimiter: :
win delimiter: ;
posix delimiter: :

delimiter: // 分割符，windows下是;（分号）Linux是：（冒号）