how to calculate a random number is js code example

Example 1: javascript get random number in range

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

//usage example: getRandomNumberBetween(20,400);

Example 2: get random numbers javascript

//Write the following code to get a random number between 0 and n
Math.floor(Math.random() * n);