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Cod: Selectaţi tot

<script>
//Returns a random integer between min (inclusive) and max (inclusive)
function randomNr(min, max){
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

//Test
var nr_al = randomNr(1, 9999);
alert(nr_al); //78 /355 /7098
</script>

Cod: Selectaţi tot

<script>
//Returns a random integer with a specified number of digits (nd)
function randomNrDigits(nd){
  var n0 =1;
  for(var i=1; i<nd; i++) n0 +='0';
  return Math.floor((1*n0) + Math.random() * (9*n0));
}

//Test
var nr_al = randomNrDigits(4);
alert(nr_al); //3424
</script>

Cod: Selectaţi tot

<script>
//Returns a random integer with digits that not repeat, with specified number of digits (nd)
function randomNrUniqueDigits(nd){
  var ar_nr =[0,1,2,3,4,5,6,7,8,9];
  for(let i = ar_nr.length -1; i >0; i--){
    let j = Math.floor(Math.random() * (i + 1));
    [ar_nr[i], ar_nr[j]] = [ar_nr[j], ar_nr[i]];
  }

  return ar_nr.splice(1, nd).join('')*1;
}

//Test
var nr_al = randomNrUniqueDigits(4);
alert(nr_al); //5940
</script>