怎么从一个数组获得新数组？

Question

1,我想把一个数组按照3等分合成一个新数组
把这个数组
vararr=[
["12"],
["blob:http://localhost:8090/a23268b6-dde4-4ae8-a845-3fc0bc9c4ef8"],
["12","12"],
["12"],
["blob:http://localhost:8090/a23268b6-dde4-4ae8-a845-3fc0bc9c4ef8"],
["12","12"]
]
变成
vararr=[arr1,arr2]
=[
[
["12"],
["blob:http://localhost:8090/a23268b6-dde4-4ae8-a845-3fc0bc9c4ef8"],
["12","12"]
],
[
["12"],
["blob:http://localhost:8090/a23268b6-dde4-4ae8-a845-3fc0bc9c4ef8"],
["12","12"]
]
]
给个方法，急！3Q3Q？

Answer 1

vararr=[["12"],["blob:http://localhost:8090/a23268b6-dde4-4ae8-a845-3fc0bc9c4ef8"],["12","12"],["12"],["blob:http://localhost:8090/a23268b6-dde4-4ae8-a845-3fc0bc9c4ef8"],["12","12"]]vararr1=arr.splice(0,3);arr=[arr1,arr];//arr这个结果就是你想要的结果