将数组分组

function chunk( arr, size) {
  let _arr = arr;
  let _size = size;
  let length = _arr.length;
  _size = Math.max(toInteger(_size), 0);
  if (!Array.isArray(_arr) || size <= 0) {
    return [];
  }

  if (length < _size) {
    return _arr;
  }

  let result = [];
  for (let index = 0, len = Math.ceil(length / _size); index < len; index++) {
    result.push(_arr.slice(_size * index, _size * (index + 1)));
  }

  return result;
}
  // 转换成整数
  function toInteger(num) {
    let _num = +num;
    
    if (isNaN(_num)) {
      return 0;
    }

    if (_num === Infinity || _num === -Infinity) {
      const sign = (_num < 0 ? -1 : 1);
      return sign * Number.MAX_VALUE;
    }

    if (_num < 0) {
      _num = Math.ceil(_num);
    } else {
      _num = Math.floor(_num);
    }

    return _num;
  }
  let obj = [
    {
      'age' : 'kkk',
    },
    1,
    2,
    undefined,
    null,
    [1, 2, 3],
  ];
    console.log(chunk(obj, 4));