True or better Random numbers with Javascript

Question

I have all kinds of resources that rely on javascript random numbers. However, I\'ve been seeing a lot of problems where random isn\'t so random because of the way I\'m gene

Answer 1

you can generate a pool of random numbers just by requesting some data asynchronously because performance.now() gives you time precision up to microseconds. Then use the response time as a salt in a randomising algorithm,

var randomNumbers = [];
for(var i = 0; i < 10; i++) {
  setTimeout(function () {
    var timeStart = performance.now();
    xhttp = new XMLHttpRequest();
    xhttp.open('GET', 'https://cdn.polyfill.io/v2/polyfill.min.js?rand=' + Math.random(), true);
    xhttp.onload = function () {
      var timeEnd = performance.now() - timeStart;
      var rNumber = parseInt(timeEnd.toString().replace('.', ''));
      randomNumbers.push(rNumber)
    };
    xhttp.send();
  }, i * 10);
}

There are many factors that will affect this time:

• browser speed
• route one way
• server response time
• route back

It's not good to generate millions of numbers this way but a few. Maybe concatenate a few results to get a good, long random number.