Generating random integer JavaScript

Question

I want to generate a random integer. When I enter a number in a textbox and call the function by clicking on a button, it says "The number was undefined", instead of giving the value of the generated number. Here is my code:

function getRandomInt(min, max){
    return Math.floor(Math.random(max-min+1)+min);
}

var array=[];
var integer=getRandomInt(1,100);
var broj=array[integer];

Answer 1

function getRandomInt(min, max) {
  return Math.random() * (max - min) + min;
}
var array=[];
function genRateNumber(){

var integer=Math.floor(getRandomInt(1,100));
array.push(integer)
console.log('array :'+array)
console.log('current Genrated  Value:'+integer)
}

<button onclick="genRateNumber()">genrate number</button>