const fs =require('fs');

//fs.writeFile(path, data, callback);
//fs.readFile(path, callback);

//写
fs.writeFile('./a.txt', 'asdasdsa', (err)=>{
    if(err){
      console.log('失败',err)
    }else{
      console.log("成功")
    }
})


//读
fs.readFile('./a.txt', (err, data)=>{
    if(err){
      console.log('失败',err)
    }else{
      console.log('成功',data)
    }
})