1.看一段代码
func main() {

    s1 := [5]int{0, 1, 2, 3, 4}
    s2 := s1
    s2[0] = 999
    fmt.Println(s1)   //[0 1 2 3 4]

    s3 := []int{0, 1, 2, 3, 4}
    s4 := s3
    s4[0] = 999    //[999 1 2 3 4]   s3数组是值类型，s3 切片本身是个引用类型
    fmt.Println(s3)
}