递归查询

findValueInNestedArrays(arr) {

    for (let i = 0; i < arr.length; i++) {

      if (arr[i].fileType == 1) {

        return arr[i];

      } else if (Array.isArray(arr[i].category)) {

        const found = this.findValueInNestedArrays(arr[i].category);

        if (found) {

          return found;

        }

      }

    }

    return false;

  },