Code implementation of file operations in the file system in Node.js
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);
});(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
});
## 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()
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
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