如何找到每个元素在嵌套数组中出现的最大次数？

function findMaxOccurrences(arr) {
  const hashMap = {};

  function countOccurrences(element) {
    if (Array.isArray(element)) {
      element.forEach(countOccurrences);
    } else {
      if (hashMap[element]) {
        hashMap[element]++;
      } else {
        hashMap[element] = 1;
      }
    }
  }

  arr.forEach(countOccurrences);

  let maxOccurrences = 0;
  let maxElement = null;

  for (const element in hashMap) {
    if (hashMap[element] > maxOccurrences) {
      maxOccurrences = hashMap[element];
      maxElement = element;
    }
  }

  return {
    element: maxElement,
    occurrences: maxOccurrences,
  };
}

const nestedArray = [1, [2, [3, 4], 5], 6, [2, 3, 4, 4]];
const result = findMaxOccurrences(nestedArray);
console.log(`元素 ${result.element} 在嵌套数组中出现的最大次数为 ${result.occurrences} 次。`);