Promise 简易封装

const { rejects } = require('assert')
const fs = require('fs')
const { resolve } = require('path')
const path = require('path')

function fu(fpath) {
    return new Promise((resolve, rejects) => {
        fs.readFile(fpath,'utf8',(res, data) => {
            if (res) return rejects(res.message)
            resolve(data)
         })
     })
}
fu(path.join(__dirname,'读取路径',(res,req)=>{console.log(res)}))