如何计算嵌套数组中值的出现次数？

function countNestedArrayValues(arr, counts) {
  for (let i = 0; i < arr.length; i++) {
    if (Array.isArray(arr[i])) {
      countNestedArrayValues(arr[i], counts);
    } else {
      if (counts.has(arr[i])) {
        counts.set(arr[i], counts.get(arr[i]) + 1);
      } else {
        counts.set(arr[i], 1);
      }
    }
  }
}

function calculateValueOccurrences(arr) {
  const counts = new Map();
  countNestedArrayValues(arr, counts);
  return counts;
}

// 示例用法
const nestedArray = [1, [2, 3, [4, 5]], 6, [1, 2, 3]];
const occurrences = calculateValueOccurrences(nestedArray);

// 输出每个值及其出现次数
occurrences.forEach((count, value) => {
  console.log(`值 ${value} 出现了 ${count} 次`);
});