Instructions for using the fs.readdir method in node.js_node.js

Method description:

Read the file directory asynchronously.

Grammar:

Copy code The code is as follows:

fs.readdir(path, [callback(err,files)])

Since this method belongs to the fs module, the fs module needs to be introduced before use (var fs= require(“fs”) )

Receive parameters:

path Directory path

callback Callback, pass two parameters err and files, files is an array containing "all file names in the specified directory".

Example:

Copy code The code is as follows:

var fs = require('fs');
fs.readdir('readdirtest', function(err,files){
if(err){
console.log(err);
}
console.log(files);
})

Source code:

Copy code The code is as follows:

fs.readdir = function(path, callback) {
callback = makeCallback(callback);
if (!nullCheck(path, callback)) return;
binding.readdir(pathModule._makeLong(path), callback);
};