Generate a random number in a range with JavaScript

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

console.log(getRandumNumber(1, 10)); 

To generate a random integer number between 2 values, including both the min and max you can use the Math.random function with some extra mathematical operations.  

The Math.random() function returns a floating-point, pseudo-random number in the range 0 to less than 1 (inclusive of 0, but not 1) with approximately uniform distribution over that range. But in real life, you don't usually want to generate a floating-point number between 0 and 1. That's why some extra operation is required with minimum and maximum values of the desired interval.

Note: Math.random() does not provide cryptographically secure random numbers. Do not use them for anything related to security. Use the Web Crypto API instead, and more precisely the window.crypto.getRandomValues() method.