const fs = require(“fs”) const promise = new Promise(function (resolve, reject) { fs.readFile(“./x.txt”, “utf-8”, function (error, data) { if (error) { // 将状态从等待变为失败 reject(error) } else { // 将状态从等待变为成功 resolve(data) } }) }) promise .then(function (data) { console.log(data) }) .catch(function (error) { console.log(error) })