[踩坑]slice引用类型的一个小坑

func test(res [][]int) {
	res[0] = []int{2,2,2,2}
	res[1][0] = 3
}

func main() {
	res := [][]int{[]int{1,1,1,1},[]int{2,2,2,2}}
	test(res)
	fmt.Printf("%#v",res)
	// out: [][]int{[]int{2, 2, 2, 2}, []int{3, 2, 2, 2}}
}

func test(res [][]int) {
	res = append(res, []int{3,3,3,3})
	res = append(res, []int{4,4,4,4})
}

func main() {
	res := [][]int{[]int{1,1,1,1},[]int{2,2,2,2}}
	test(res)
	fmt.Printf("%#v",res)
	// out: [][]int{[]int{1, 1, 1, 1}, []int{2, 2, 2, 2}}
}