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大家好！我是/小郑搞码事/的小郑

今天和大家分享Node.js的path模块，它有哪些日常工作中常用的路径操作方式。

以下涉及到的例子都需要引入path模块：

var path = require('path')

// 获取当前文件夹和文件名的完整路径console.log(__dirname)console.log(__filename)// 获取当前执行目录shell所在位置console.log(process.cwd())// 将node命令定位到根目录下process.chdir("/") console.log(process.cwd())// 查询bin目录安装的地方console.log(process.execPath)

var dir = ['foo','bar','baz']// foo/bar/baz - linux console.log(dir.join('/')) // foo\bar\baz - windowconsole.log(dir.join('\\'))// /-linux \-windowconsole.log(path.sep) // foo/bar/bazconsole.log(dir.join(path.sep))

// 获取分隔符 :console.log(path.delimiter) process.env.PATH.split(path.delimiter).forEach(function(dir) {  console.log(dir)})// 获取环境变量console.log(process.env.PATH)

// path.extnamevar filename = "/foo/bar/baz.txt"var extname = path.extname(filename)console.log(extname)

// 方法：path.basenamevar filename = "/foo/bar/baz.txt"var file = path.basename(filename)console.log(file)

// 方法：path.dirname// /foo/barvar filename = "/foo/bar/baz.txt"var file1 = path.dirname(filename)console.log(file1)

// 方法：path.normalizevar dirName = "/foo/bar/.././bar/../../baz" var normalized = path.normalize(dirName)console.log(normalized)  // /bazvar normalizej = path.join("/foo/bar",".././bar","../../","/baz")console.log(normalizej)

// 方法：path.relativevar from = '/foo/bar'var to = '/baz/biff'// 传两个参数都是绝对路径，返回的是第二个参数相对于第一个参数的路径var relative = path.relative(from ,to)console.log(relative) // ../../baz/biff

resolve：返回的是根目录下文件的绝对路径

// path.resolve 返回的是根目录下文件的绝对路径console.log(path.resolve('../foo/bar','./baz'))// /Users/zhengwenping/project/learning/node-learn/n

join：拼路径

var p = path.join('../foo/bar','./baz')// ../foo/bar/bazconsole.log(p)

isAbsolute：判断是否为绝对路径

// falseconsole.log(path.isAbsolute('./foo/bar')) // trueconsole.log(path.isAbsolute('/foo/bar'))

parse：输出路径的信息

/** * { root: '/',  dir: '/home/user/dir',  base: 'file.txt',  ext: '.txt',  name: 'file' } */var parsed = path.parse('/home/user/dir/file.txt');console.log(parsed)

format：parse的逆过程

var pf = path.format({  dir: '/home/user/dir',  base: 'file.txt'})console.log(pf) // /home/user/dir/file.txt