do while实现九宫格概率抽奖

function lottery() {
  const prizes = [
    { name: 'prize 1', probability: 0.1 },
    { name: 'prize 2', probability: 0.2 },
    { name: 'prize 3', probability: 0.3 },
    { name: 'prize 4', probability: 0.05 },
    { name: 'prize 5', probability: 0.15 },
    { name: 'prize 6', probability: 0.1 },
    { name: 'prize 7', probability: 0.08 },
    { name: 'prize 8', probability: 0.01 },
    { name: 'prize 9', probability: 0.01 }
  ];
  let selectedPrize;
  let randomNum;
  do {
    randomNum = Math.random();
    for (let i = 0; i < prizes.length; i++) {
      if (randomNum <= prizes[i].probability) {
        selectedPrize = prizes[i];
        break;
      } else {
        randomNum -= prizes[i].probability;
      }
    }
  } while (!selectedPrize);
  return selectedPrize;
}
console.log(lottery());