[node] common methods of path module

path The module provides a series of methods to operate on the path ,path The return result of all methods of the module is a path string

• join
  String concatenation , Generate new path

  const path = require("path");
  
  const p = path.join("user", "file", "01.js"); // user\file\01.js
  

  join The input parameters of the method are several strings ,join Method will use all strings \ The backslashes are spliced together to create a new path
• node Constant ( Commonly used for path operations )
  • __dirname
    The absolute path of the folder where the current file is located
  • __filename
    Absolute path to the current file
• resolve
  Convert parameters to absolute paths , Splice based on the absolute path of the folder where the current file is located

  path.resolve("file");
  path.resolve("./file");
  //  example ：F:\aaa\...\bbb\file
  

  The above two cases will be spliced backward based on the absolute path of the folder where the current file is located , Generate new path

  path.resolve("/file");
  //  example ：F:\file
  

  With / The slash will start with the drive letter of the current file

  path.resolve("a", "c", "b", "d", "e"); // F:\d\e
  path.resolve("/a", "/c", "b", "/d", "e"); // F:\file\...\a\c\b\d\e
  

  There are many. , But it's not just arguments that start with slashes , Starting from the drive letter, the last parameter starting with a slash to all the last parameters are spliced in turn
• parse
  Parsing path , Parse the path string into a routing object

  path.parse("F:/aaa/bbb/ccc/path.js");
  /* { root: 'F:/', dir: 'F:/aaa/bbb/ccc', base: 'path.js', ext: '.js', name: 'path' } */
  

  attribute	describe
  root	Drive letter of directory
  dir	Absolute path
  base	The full name of the file to which the path points ( Include file suffixes )
  ext	file type , If it's a folder , Is an empty string
  name	File name