mongodb 二维数组的操作，不含key

数组形式:

data: {
number: [
[1,2,3,4,5,6,7,8,9,0],
[1,2,3,4,5,6,7,8,9,0],
[1,2,3,4,5,6,7,8,9,0],
[1,2,3,4,5,6,7,8,9,0],
[1,2,3,4,5,6,7,8,9,0]
],
timer: 12345678901
}

条件：

number: [[1], [2], [3], [4],[5]] or number: [1,2,3,4,5]

请问下，我怎么取出该数组？