Golang Unmarshal切片的int切片

How do you unmarshal a JSON into a slice of slices of ints? I keep on getting a blank struct: https://play.golang.org/p/Hgnh5C9FN_

Also is it possible to unmarshal something like [[1 2][3 4]] without a key e.g. {"key":[[1 2][3 4]]}?

It seems there is a three issues in your provided code snippet.

• Struct field have to be exported, refer to Exported vs Unexported identifiers
• Your JSON data is invalid invalid character '[' after array element {[]}
• Field data type definition

I have updated your code here https://play.golang.org/p/zX7KEPKB8H

Output {[[1 2] [3 4]]}