Generating a random number in JavaScript

A random number is useful in the creation of certain popular JavaScript applications, such as dice, random image script, or random link generator. Here, we will learn how to output a random number that falls within the range 1 to x, where x is any integer >1. The results may be unpredictable, but the technique is not. To generate a random number in JavaScript, simply use the following code:

var randomnumber=Math.floor(Math.random()*11)

The number 11 dictates that the random number will fall between 0-10. To increase the range to, say, 100, simply change 11 to 101.

Why Math.floor(), instead of Math.round(), is used in the above code
While both expressions successfully round off containing parameters to an integer within the designated range, Math.floor does this more "evenly." The resulting integer is not skewed toward either end of the number spectrum. In other words, a more random number is returned using Math.floor().