nodejs如何从异步回调函数返回想要的值

const fs = require(‘fs‘)

let read=()=>{
    fs.readFile("./contents/test.json",(err,data)=>{
        return JSON.parse(data.toString())
    })
}

(()=>{
    let result = read()
    console.log(result)  //undefind
})()

const fs = require(‘fs‘)

let read=async ()=>{
    return new Promise((resolve,reject)=>{
        fs.readFile("./contents/test.json",(err,data)=>{
            if(err) reject(err)
            resolve(JSON.parse(data.toString()))
        })
    })

}

(async ()=>{
    let result =await read()
    console.log(result)    //{msg:"ok"}
})()