SOURCE

 function reqyest(a,params,flag) {
    return new Promise(function(resolve,reject){
        if(flag){
            setTimeout(()=>reject('reject错误:   '+a+':'+(params||'')),1000);
        } else {
            setTimeout(()=>resolve(a+':   '+(params||'')),1000);
        }
    })
}

reqyest('https',123456,0).then(res=>{
	console.log(res)
})

async function aa () {
    try{
         let bb = await reqyest('https',123456,1);
         console.log(bb)
    }catch(err){
        console.log(err)
    }
}
aa()