go slice与函数

package main
import (
    "fmt"
)

func myfun(a []int){
        fmt.Println(a)
        a[0] = 8
        a[1] = 8
        a[2] = 8
        fmt.Println(a)
}
func main() {
    a := make([]int,3)
    a[0] = 1
    a[1] = 2
    a[2] = 3
    myfun(a)
    fmt.Println(a)
}