const fs = require(‘fs‘);
fs.readFile(‘./package.json‘,(err,data) => {
  if(err) return console.log(err);
  data =JSON.parse(data)
  console.log(data)
})

const fs = require("fs");
?
function promiseFun(path) {
  console.log(path)
  
 
return new Promise((resolve, reject) => {
    fs.readFile(path, (err, data) => {
      if (err){ reject(err)}
      else{ resolve(data);}
    });
  });
}
?
promiseFun(‘./package.json‘)
  .then(data => {
    data = JSON.parse(data);
    console.log(data.name);
  })
  .catch(err => {
    console.log(
 
"err");
  }); 

const fs = require("fs");
const util = require(‘util‘);
util.promisify(fs.readFile)(‘./package.json‘)
.then(JSON.parse)
.then(data => {
  console.log(data.name);
})
.catch(err => {
  console.log(err)
})

const fs = require("fs");
const util 
 
= require(‘util‘);
const readAsync=util.promisify(fs.readFile);
?
?
async function init() {
  try {
    let data = await readAsync(‘./package.json‘)
    data = JSON.parse(data);
    console.log(data);
  }catch(err){
    console.log(err)
  }
}

node 異步回調 —叠代記錄