let getGiftAsync=()=>{
    return new Promise((resolve,reject)=>{
        setTimeout(()=>{
            if(Math.random()<0.2){
                let gift="小白妞";
                resolve(gift);
            }else{
                let gift="小黑妞";
                reject(gift)
            }
        },2000);
    })
}

asynv function useAsynFunc(){
    let gift = await getGiftAsync;
    console.log(gift);
}

useAsynFunc();