Javascript/html: How to generate random number between number A and number B?

We have a form with 2 fields and a button. We want on button click to output random int number (like 3, 5 or 33) which would lie between int A and int B? (no use of 开发者_C百科jQuery or anything like it is required)

You can use Javascript Math.random

function randomInRange(start,end){
       return Math.floor(Math.random() * (end - start + 1) + start);
}

Use something like Math.floor(Math.random()*(intB-intA +1)) + intA ?

Like this:

Math.floor(a + Math.random() * (b - a))

The Math.random() method returns a random floating-point number in the range [0,1) — that is, between 0 (inclusive) and 1 (exclusive).