SOURCE

// Promise.retry 超时重新请求，并在重试一定次数依然失败时输出缓存内容
async function retry(url, times,res = []){
    if(times===0){
        console.log(res)
        return Promise.reject("failed")
    }
    let ans = null
    try {
       const ans = await Promise.race([myFetch(url), new Promise((resolve, reject)=>{
            setTimeout(()=>{
                reject("reason")
            },1000)
        })])
        // 如果await Promise.race出错了,直接跳到catch里面
        // console.log(a)
    }catch (e) {
        res.push(e)
        // console.log(e)
    }finally {
        console.log("try finish")
        if(ans!==null){
            //没出错,但是可能之前出错了..这次没出错,所以应该改为
            return Promise.resolve("success")
        }else{
            retry(url, times-1,res)
        }
    }
}

function myFetch(url){
    return new Promise((resolve, reject)=>{
        setTimeout(()=>{
            resolve("success")
        },1100)
    })
}

(async function() {
    try{
        await retry("test", 2)
    }catch(e){
        console.log(e)
    }
//   console.log(await retry("test", 2))
})()