path模块是node.js中处理路径的核心模块。可以很方便的处理关于文件路径的问题。
join() 将多个参数值合并成一个路径
const path = require('path');
console.log(path.join('./a','b','c'));
const path = require('path');
//获取文件名，包含扩展名
console.log(path.basename('./a/b/c/1.txt'));
//获取文件名，去掉扩展名
console.log(path.basename('./a/b/c/1.txt','.txt'));
extname() 获取路径中的扩展名
sep 返回操作系统指定的路径分割符
const path = require('path');
console.log(path.sep);
console.log(path.win32.sep);
console.log(path.posix.sep);
delimiter 返回操作系统环境变量的分割符
const path = require('path');
console.log(path.delimiter);
console.log(path.win32.delimiter);
console.log(path.posix.delimiter);
normalize() 将非标准的路径转换成标准路径，解析像 '.' ，'..'，或多个杠。
const path = require('path');
console.log(path.normalize('./a/b/../../c'));
console.log(path.normalize('./a//b//.././c'));
resolve() 返回绝对路径
const path = require('path');
console.log(path.resolve('./a/b/../c/./d'));
isAbsolute() 判断是否为绝对路径
const path = require('path');
console.log(path.isAbsolute('./a/b/../c/./d'));
console.log(path.isAbsolute('E:/a'));
parse() 解析一个路径，返回一个带有属性的对象
const path = require('path');
console.log(path.parse('./a/b/../c/./d/1.txt'));
relative() 返回参数一到参数二的相对路径
const path = require('path');
console.log(path.relative('./a/b/c','./a/d'));
