基于JavaScript实现微信抢红包功能

金额随机：额度在0.01和(剩余平均值*2)之间。

/**
 * 抢红包
 * @param {[number]} totalAmount [总金额]
 * @param {[number]} totalPeople [总人数]
 * @return {[Array]}       [每个人抢到的金额]
 */
function assign(totalAmount, totalPeople){
  var remainAmount = +totalAmount;
  var remainPeople = +totalPeople;
  var arr = [];
  while(remainPeople > 0){
    let num = scramble(remainAmount, remainPeople);
    remainAmount = remainAmount - num;
    remainPeople--;
    arr.push(num);
  }
  return arr;
}
function scramble(remainAmount, remainPeople){
  if(remainPeople === 1){
    return +remainAmount.toFixed(2);
  }
  let max = ((remainAmount / remainPeople) * 2 - 0.01).toFixed(2);
  let min = 0.01;
  let range = max - min;
  let rand = Math.random();
  let num = min + Math.round(rand * range); //四舍五入
  return num;
}

总结

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