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

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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);
});

(2) Write file

fs.writeFile()

# fs.appendFile()

// 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
});

##                                                                                                                                                                                  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('../fs/zhang.txt','2014年毕业\n',function (err) {
        if (err) throw err;
    })
};

fs.unlink()

fs.unlinkSync()

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