版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/qq_38355456/article/details/78846208
1、读取文件: fs.readFile(filename,callback);
const fs=require('fs');
const path=require('path');
const dir=path.resolve('../mkdir/index.html');
console.log(dir);
function read(dir){
return new Promise((resolve,reject)=>{
fs.readFile(dir,'utf-8',(err,data)=>{
if(err){
reject(console.log(err))
}else{
resolve(console.log(data))
}
})
})
}
read(dir);
2、写入文件:fs.writeFile(filename,content,callback);
const fs = require('fs');
const path = require('path');
const filename = path.resolve('test2.txt');
function write() {
return new Promise((resolve, reject) => {
fs.writeFile(filename, '我是颜乐乐', (err, data) => {
if (err) {
reject(err);
}
resolve(console.log('写入完成'))
});
})
}
async function start() {
await write();
fs.readFile(filename,'utf-8',(err,data)=>{
if(err){
throw err
}else{
console.log(data.toString());
}
})
}
start();
3、追加文件内容:fs.writeFile(filename,content,{flag:'a'},callback)
const fs =require('fs');
const path=require('path');
const filename=path.resolve('test3.txt');
console.log(filename);
function write(){
return new Promise((resolve,reject)=>{
fs.writeFile(filename,'我希望我是追加的内容',{'flag':'a'},(err)=>{
if(err){
reject(err)
}
resolve(console.log('追加内容成功'))
});
})
}
async function start(){
await write();
fs.readFile(filename,'utf-8',(err,data)=>{
if(err){
console.log('读取文件失败');
return console.log(err);
}else{
console.log(data.toString());
}
})
}
start();
const fs=require('fs');
const path=require('path');
const filename=path.resolve('test.js');
console.log(filename);
function remove(){
return new Promise((resolve,reject)=>{
fs.unlink(filename,(err)=>{
if(err){
reject(console.log(err))
}
resolve(console.log('删除文件成功'))
});
})
}
async function start(){
await remove();
fs.readdir(__dirname,(err,files)=>{
if(err){
return console.log(err)
}else{
files.forEach((item)=>{
console.log(item)
})
}
})
}
start();