1//To genereate a number between 0-1
2Math.random();
3//To generate a number that is a whole number rounded down
4Math.floor(Math.random())
5/*To generate a number that is a whole number rounded down between
61 and 10 */
7Math.floor(Math.random() * 10) + 1 //the + 1 makes it so its not 0.

1Math.random() 
2// will return a number between 0 and 1, you can then time it up to get larger numbers.
3//When using bigger numbers remember to use Math.floor if you want it to be a integer
4Math.floor(Math.random() * 10) // Will return a integer between 0 and 9
5Math.floor(Math.random() * 11) // Will return a integer between 0 and 10
6
7// You can make functions aswell 
8function randomNum(min, max) {
9	return Math.floor(Math.random() * (max - min)) + min; // You can remove the Math.floor if you don't want it to be an integer
10}

1function getRandomNumberBetween(min,max){
2    return Math.floor(Math.random()*(max-min+1)+min);
3}
4
5//usage example: getRandomNumberBetween(20,400); 
6

1function randomNumber(min, max) {
2  return Math.floor(Math.random() * (max - min)) + min + 1;
3}

1function getRandomIntInclusive(min, max) {
2  min = Math.ceil(min);
3  max = Math.floor(max);
4  return Math.floor(Math.random() * (max - min + 1)) + min; //The maximum is inclusive and the minimum is inclusive 
5}

1var n = Math.random();
2n = Math.floor((n * 6) + 1); // if you want your numbers to start at 1 and end at 6 
3console.log(n);