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                ``` // let path = require('path'); //一個'\'是打印不出來的,它是轉義符,有特殊意義 // console.log('\'); //報錯 /** * normalize * 對路徑進行容錯處理 * 主要是 路徑分隔符多不多,有沒有..有的話自動轉化 */ const {normalize} = require('path'); console.log(normalize('/usr//local/bin')); // /usr/local/bin console.log(normalize('usr//local/../bin')); // /usr/bin /** * join * 在拼接路徑之前hi調用normalize */ const {join} = require('path'); console.log(join('usr/','local','bin')); // usr/local/bin /** * 將相對路徑解析成絕對路徑 */ const {resolve} = require('path'); console.log(resolve('./')) /** * basename,dirname,extname */ const {basename,dirname,extname} = require('path'); const filePath = '/usr/local/bin/no.txt'; console.log(basename(filePath)); //no.txt console.log(dirname(filePath)); //文件夾 /usr/local/bin console.log(extname(filePath)); //后綴 /** * parse 和 format 作用是相反的 * return pathObject */ const {parse,format} = require('path'); const ret = parse(filePath); console.log(ret); // { root: '/', // dir: '/usr/local/bin', // base: 'no.txt', // ext: '.txt', // name: 'no' } console.log(format(ret)); // /usr/local/bin/no.txt //format若存在沖突dir和base的優先級較高 /** * */ const { sep, delimiter, win32, posix } = require('path'); console.log('sep:',sep); //當前系統的路徑分隔符 console.log('win sep',win32.sep); //查看window下的路徑分隔符 console.log('posix sep',posix.sep); console.log('PATH',process.env.PATH); //系統環境變量 console.log('delimiter:',delimiter); // : 系統環境變量的分隔符 ``` ``` let path = require('path'); // const mod = require('./0'); // console.log(mod.testVar); console.log('__dirname',__dirname); //D:\WEB\zfplan\studydaydayup\node\node-base\path console.log('process.cwd()',process.cwd()); //D:\WEB\zfplan\studydaydayup\node\node-base\path console.log('./',path.resolve('./')); //D:\WEB\zfplan\studydaydayup\node\node-base\path /** * 若用命令行打印 此時若在命令行中退后一層 再打印 * cwd,resolve 為命令行所處位置,而__dirname和__filename永遠是絕對路徑 */ /** 對于 : 【./】 * require方法無論怎么調都是文件的絕對路徑 * 其它地方和process.cwd一樣,是指node啟動的路徑位置 */ ``` ## process.chdir可以更改當前控制臺位置 ![](https://box.kancloud.cn/825ee3379814b97599bffdcc473c535f_275x182.png) ![](https://box.kancloud.cn/fb18cd5130d14bfc1cef2c107b1b4e55_474x119.png)
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