Function getRandomArrayElements

jd_summer_movement_help.js:376–385

* 随机从一数组里面取 * @param arr * @param count * @returns {Buffer}

(arr, count)

 * @returns {Buffer}
 */
 function getRandomArrayElements(arr, count) {
  var shuffled = arr.slice(0), i = arr.length, min = i - count, temp, index;
  while (i-- > min) {
    index = Math.floor((i + 1) * Math.random());
    temp = shuffled[index];
    shuffled[index] = shuffled[i];
    shuffled[i] = temp;
  }
  return shuffled.slice(min);
}

// 随机数
function getRndInteger(min, max) {