javascript JavaScript：从特定范围获取随机数

Posted 2021-05-03

/**
 * Get a random floating point number between `min` and `max`.
 * 
 * @param {number} min - min number
 * @param {number} max - max number
 * @return {number} a random floating point number
 */
function getRandomFloat(min, max) {
  return Math.random() * (max - min) + min;
}

/**
 * Get a random integer between `min` and `max`.
 * 
 * @param {number} min - min number
 * @param {number} max - max number
 * @return {number} a random integer
 */
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1) + min);
}

/**
 * Get a random boolean value.
 * 
 * @return {boolean} a random true/false
 */
function getRandomBool() {
  return Math.random() >= 0.5;
}

function getRandomIntByInterval (min, max, step){
	let f = Math.floor((max - min)/step)
	let e = Math.floor(Math.random() * (f + 1));
	return e * step + min;
}