初始化: res := make([][length]int, length), 例如: res := make([][2]int, 10) fmt.Println(res) 输出: [[0 0] [0 0] [0 0] [0 0] [0 0] [0 0] [0 0] [0 0] [0 0] [0 0]] 或者 a := [][]float64{ {1, 2, 3, 4}, {12, 21, 3, 14}, {1, 1, 2, 3}, {2, 3, 1, 6}, {2, 2, 3, 3}, {1