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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