一、Demo

1、首先定义 module 文件：bbb.js

const fs = require("fs");

function readFileSync() {
  let result = fs.readFileSync("./result.log");
  return result;
}

async function readFileAsync() {
  let result = await new Promise((resolve, reject) => {
    fs.readFile("./result.log", (err, data) => {
      if (err) reject(err);
      resolve(data);
    });
  });
  return result;
}

module.exports = { readFileSync, readFileAsync };

2、添加 main 文件：aaa.js

const bbb = require("./bbb");

// readFileSync
// console.log("re:", bbb.readFileSync());

// readFileAsync
(async () => {
  let result;
  result = await bbb.readFileAsync();
  console.log("re:", result);
})();

二、追问

原文地址：https://www.cnblogs.com/xjnotxj/p/11113502.html