node.js the File module

What 1.Node.js that?

(1) Nodejs is a technology to develop high-performance servers and birth

(2)  Simply put Node.js is running on the server side JavaScript , based on the V8 were running 

(3) Node.js uses an event-driven, non-blocking I / O model, it lightweight and efficient . 

 

2.Node.js the File module

1. The intake module

 1 var fs = require("fs"); 

2. Operation Folder

2.1 Create a folder

// Create a folder -fs.mkdir 
fs.mkdir (path [, Options], callback)
 // Create a folder test
fs.mkdir("./test", function (err) {
    if (err) {
        return console.error("创建失败：", err);
    }
    console.log ( "folder is created." );
});

2.2 reading folder

// read the folder 
fs.readdir (path, callback)
 // read the current test file in the directory folder contents 
fs.readdir ( "./ test", function (ERR, Files) {
    IF  (ERR) {
        return  Console .error ( "failed to read the folder:" , ERR);
   }
   files.forEach( function (file){
       console.log( file );
   });
});

3.3 delete folders

// delete folders 
fs.rmdir (path, callback)

fs.rmdir("./test",function(err){
   if (err) {
       return console.error("删除失败：",err);
   }
   console.log ( "deleted successfully" );
});

3.4 write (create) file

fs.writeFile(filename,data,callback)
     filename: write to the file name
     data: Data written to the file (String | Buffer)
     callback (err): Error Message Parameters

3.5 reads the contents of the file