js promises

index.html

<script>
  var aCallWithDelayOf_1secs = new Promise(function (resolve, reject) {
    setTimeout(function () {
      resolve('Success!');
    }, 1000);
    //   reject('Failure!');
  });

  var aCallWithDelayOf_2secs = new Promise(function (resolve, reject) {
    setTimeout(function () {
      resolve('Success!');
    }, 2000);
    //   reject('Failure!');
  });

  alert("now");

  Promise.all([aCallWithDelayOf_1secs, aCallWithDelayOf_2secs]).then(function (results) {
    alert("3 seconds");
  });

  //https://davidwalsh.name/promises

</script>