package main;

import "fmt"

func  test () {
   s1 := []int{1,2,3,4,5}
   s2 := make([]int, 10)
   fmt.Println(s2);
   copy(s2, s1)
   fmt.Println(s2);
}
func  main () {
   test()
}

输出：

[0 0 0 0 0 0 0 0 0 0]
[1 2 3 4 5 0 0 0 0 0]