js将一个数组分成多个数组

1,将数组array分成长度为subGroupLength的小数组并返回新数组

function group(array, subGroupLength) {
      let index = 0;
      let newArray = [];
      while(index < ) {
          ((index, index += subGroupLength));
      }
      return newArray;
  }
 2,例如：
 var Array = [1,2,3,4,5,6,7,8,9,10,11,12];;
 var groupedArray = group(Array, 6);
 得到的groupedArray 数组为：
    groupedArray[[1,2,3,4,5,6],[7,8,9,10,11,12]]

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