如何从嵌套数组中获取选定的索引？Angular - Javascript

function findIndexInNestedArray(arr, target) {
  let result = null;

  function search(arr, target, path = []) {
    for (let i = 0; i < arr.length; i++) {
      const current = arr[i];

      if (Array.isArray(current)) {
        const nestedPath = [...path, i];
        const nestedResult = search(current, target, nestedPath);

        if (nestedResult !== null) {
          return nestedResult;
        }
      } else if (current === target) {
        return [...path, i];
      }
    }

    return null;
  }

  result = search(arr, target);

  return result;
}

const nestedArray = [1, 2, [3, 4, [5, 6, 7], 8], 9];
const target = 5;

const index = findIndexInNestedArray(nestedArray, target);
console.log(index); // 输出 [2, 2, 0]