Home > Web Front-end > JS Tutorial > Code implementation of file operations in the file system in Node.js

Code implementation of file operations in the file system in Node.js

不言
Release: 2018-08-23 17:24:39
Original
1319 people have browsed it

The content of this article is about the code implementation of file operations in the file system in Node.js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

File operation

(1) Read file

                                                                                                                                                                                                        fs.readFile()

         fs.readFileSync()

Fs-3.js

// 导入模块
const fs = require('fs');

// 读取文件
// 中文格式输出方法一:utf8
fs.readFile('../fs/zhang.txt','utf8',function (err,data) {
    if(err) throw err;
    console.log(data);
});

// 中文格式输出方法二:toString()
fs.readFile('../fs/zhang.txt',function (err,data) {
    if(err) throw err;
    console.log(data.toString());
});

// 中文格式输出方法三:{encoding:'utf8'}
fs.readFile('../fs/zhang.txt',{encoding:'utf8'},function (err,data) {
    if(err) throw err;
    console.log(data);
});
Copy after login

(2) Write file

fs.writeFile()

# fs.appendFile()

## fs.appendFileSync()

// 写入文件
   fs.writeFile('../fs/zhang.txt','web前端工程师\n',function (err) {
       if (err) throw err;
       console.log("文件写入成功");//输出web前端工程师,覆盖原有的内容
   });

   //假如写入的文件不存在,会自动创建个zhang2.txt文件
fs.writeFile('../fs/zhang2.txt','web前端工程师\n',function (err) {
    if (err) throw err;
    console.log("文件写入成功");//输出web前端工程师
});
Copy after login

(4) Copy File

##                                                                                                                                                                                  through File content truncation

fs.truncate()

fs.truncateSync()

// 追加文件,保留原先的内容
for (let i = 0;i<10;i++){
    fs.appendFile(&#39;../fs/zhang.txt&#39;,&#39;2014年毕业\n&#39;,function (err) {
        if (err) throw err;
    })
};
Copy after login
(6) Delete files

fs.unlink()

fs.unlinkSync()

Related recommendations:

Code implementation of file directory operations in the file system in Node.js

Synchronization and synchronization of the file system in Node.js Asynchronous implementation

The above is the detailed content of Code implementation of file operations in the file system in Node.js. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template