Javascript Get Random result with probability for specific array

Question

i have a array and i need to do it randomly show the output by probability below are my code

var shirts = [
                      [\"images/fantastic-logo.pn         


        

Answer 1

function getRandomInt(max) {
  return Math.floor(Math.random() * Math.floor(max));
}
/* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random */

getRandomInt(3)

If you get 0 or 1, the first image is selected. But this method is not elegant. Please refer to the link below.

Generate A Weighted Random Number