数值转换成比例

/**
 * 比例计算
 * @param {Array} list 数组
 * @return {Array}
 */
export function getRateCalculate(list) {
  if (!list || !list.length) {
    return [];
  }
  console.log(list);
  let totalRate = 0;
  const total = list.reduce((prev, cur) => {
    return prev + Number(cur);
  }, 0);
  if (total === 0) {
    return list;
  }
  let arr = list.map(item => {
    item = Number(((item / total) * 10000).toFixed(0));
    totalRate += item;
    return item;
  });
  let dir = totalRate - 10000;
  if (dir > 0) {
    for (let i = 0; i < dir; i++) {
      arr[i] -= 1;
    }
  } else if (dir < 0) {
    dir = -dir;
    for (let i = 0; i < dir; i++) {
      arr[i] += 1;
    }
  }
  arr = arr.map(item => item / 100);

  return arr;
}