A deep understanding of the path module of node. js, node. jspath

A deep understanding of the path module of node. js, node. jspath

Node path Module

// Reference this module var path = require ("path ");

1. parse the path to obtain the canonicalized path format.

// For the window system, the directories are separated into '\'. For UNIX systems, the separator is '/', '.. 'back to the upper level; // and \ are uniformly converted // path. normalize (p); var myPath = path. normalize (_ dirname + '/test/a/B //.. /c/utilyou.mp3 '); console. log (myPath); // windows: E: \ workspace \ NodeJS \ app \ fs \ test \ a \ c \ utilyou.pdf

2. Path combination and merge. The path does not contain directory separators at last.

// Path. join ([path1], [path2] .. [pathn]);/*** [path1] path or a directory character, */var path1 = 'path1', path2 = 'path2 // pp \\', path3 = '.. /path3 '; var myPath = path. join (path1, path2, path3); console. log (myPath); // path1 \ path2 \ path3

3. Obtain the absolute path

// Path. resolve (path1, [path2] .. [pathn]); // starts with an application, parse an absolute path/*** path according to the parameter string. At least one path string value * [pathn] Optional path string */var myPath = path. resolve ('path1', 'path2', 'A/B \ c/'); console. log (myPath); // E: \ workspace \ NodeJS \ path1 \ path2 \ a \ B \ c

4. Obtain the relative path

// Path. relative (from, to); // obtain the relative relationship between two paths/*** from current path, in addition, the return value of the method is based on the relative path * to specified by from, */var from = 'C: \ from \ \\', to = 'C:/test/B '; var _ path = path. relative (from, to); console. log (_ path );//.. \.. \ test \ B; indicates the relative path from

5. path. dirname (p)

// Obtain the directory name var myPath = path. dirname (_ dirname + '/test/util youning'); console. log (myPath );

6. path. basename (path, [ext])

// Obtain the file name in the path. The suffix is optional. Use '. ext, the suffix is not included in the returned value; var myPath = path. basename (_ dirname + '/test/util youxian', 'shanghai'); console. log (myPath );

7. path. extname (path) // obtain the extension in the path. If '.' is not found, null is returned.

8. path. sep properties // return the file Separator in the operating system; window is '\'; Unix is '/'

9. path. delimiter properties // return the directory Separator in the operating system, for example, window is ';', Unix is ':'

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