select a random number in javascript code example

Example 1: get random numbers javascript

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

Example 2: how to write a program that shows a random number between 1 and 100 in your browser

var randomNum ;
randomNum = Math.ceil(Math.random() * 100);
document.write("Random number between 1 and 100: " + randomNum)