Node.js path模块

const path = require('path')

//1,仅仅可以做到返回 字符串 文件名 后缀名
// 获取文件后缀名

const file1 = '1.jpg'
const file2 = '1.png'

const ext1 = path.extname(file1)
const ext2 = path.extname(file2)
console.log(ext1);
console.log(ext2);

//2,拼接文件路径

const level1 = "data1";
const level2 = "data2";
const level3 = "data3";
const level4 = "data4";
const fileName = "1.txt";


const fullPath = path.join(level1, level2, level3, level4, fileName)
const fullPath = path.join(level1, level2, level3, level4, '../', fileName)
console.log(fullPath);


//3,获取绝对路径
const fullPath = path.join(__dirname, 'data', '03.JSON')
console.log(fullPath);