sleep-promise.js

function sleep(milliseconds) {
    var start = new Date().getTime();
    for (var i = 0; i < 1e7; i++) {
        if ((new Date().getTime() - start) > milliseconds){
            break;
        }
    }
}
var results = Promise.all([1,2,3].map(async (x) => { sleep(5000); await console.log(x); }));