asyncawait.js

async function test(){
    await foo(1, 2000)
    await foo(2, 500)
    await foo(3, 1000)
}

function foo(num, sec){
    return new Promise(function(resolve, reject){
        setTimeout( function(){
            console.log(num);
            resolve("async는 Promise방식을 사용합니다.");
        }, sec);
    });
}
test();