Instructions for the fs.chmod method in node.js

method description:

This method overwrites a file asynchronously.

The callback after the operation is completed receives only one parameter, and abnormal information may occur.

syntax:

fs.chmod(path, mode, callback)

Since this method belongs to fs module, fs module (var fs = require(" fs ") needs to be introduced before use.)

receive parameters:

1. path               file path

2. mode           read and write permissions (e.g. 777)

3. callback   callback

example:

var fs = require('fs'),

 oldFilename = "./processId.txt",

 newFilename = "./processIdOld.txt";

fs.chmod(oldFilename, 777, function (err) {

 fs.rename(oldFilename, newFilename, function (err) {

  fs.lstat(newFilename, function (err, stats) {

   var isSymLink = stats.isSymbolicLink();

  });

 });

});

source code:

fs.chmod = function(path, mode, callback) {

  callback = makeCallback(callback);

  if (!nullCheck(path, callback)) return;

  binding.chmod(pathModule._makeLong(path),

                modeNum(mode),

                callback);

};