Generate random number using bitwise operator to round values.

random.js

/**
 * Generate random integer from 0 to limit.
 */
function rnd(limit) {
    return (Math.random()*limit)|0;
}

/**
 * Generate random float value in range.
 */
function randomFromRange(from, to) {
    return parseFloat((Math.random() * (from - to) + to).toFixed(5));
}