sleep in js

sleep.js

function sleep(milliseconds) {
  var start = new Date().getTime();
  for (var i = 0; i < 1e7; i++) {
    if ((new Date().getTime() - start) > milliseconds){
      break;
    }
  }
}
const start = +new Date;
console.log('Dude!');
sleep(10000);
const end = +new Date;
console.log('end-start='+(end-start))