封装读取文件

const fs=require('fs');

fs.readFile('./resources/为学.md',(err,data)=>{
if(err) throw err;
console.log(data.toString());
});

------------------

const p=new promise(function(resolve,reject){
fs.readFile("./resources/为学.md",(err,data){
if(err) reject(err);
resolve(data);
});
});


p.then(function(value){
console.log(value.toString());
},function(reason){
console.log('读取失败');
});