在Javascript中对一维数组的元素进行分组以形成交错的二维数组

function groupArrayElements(arr, size) {
  var result = [];
  for (var i = 0; i < arr.length; i += size) {
    result.push(arr.slice(i, i + size));
  }
  return result;
}

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var size = 3;
var result = groupArrayElements(arr, size);
console.log(result);

function groupArrayElements(arr, size) {
  return arr.reduce(function(result, value, index) {
    if (index % size === 0) {
      result.push([value]);
    } else {
      result[result.length - 1].push(value);
    }
    return result;
  }, []);
}

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
var size = 3;
var result = groupArrayElements(arr, size);
console.log(result);