js 数组中超过三个或三个以上相同的数字，返回其索引

js 数组中超过三个或三个以上相同的数字，返回其索引

function findRepeatedIndexes(arr) {
  const repeatedIndexes = {};
  arr.forEach((num, index) => {
    if (repeatedIndexes[num]) {
      repeatedIndexes[num].push(index);
    } else {
      repeatedIndexes[num] = [index];
    }
  });
  
  const result = [];
  Object.keys(repeatedIndexes).forEach(key => {
    if (repeatedIndexes[key].length >= 3) {
      result.push(repeatedIndexes[key]);
    }
  });
  
  return result;
}
// 使用
findRepeatedIndexes([1,2,1,1,5])   //输出  [0, 2, 3]