package main
import "fmt"
func main() {
  var numbers =[]int{10,20,30,40,50,60,90}
  fmt.Println(len(numbers))//长度
  fmt.Println(numbers)
  numbers = append(numbers, 80,1,3,5)//新增
  fmt.Println(len(numbers))
  fmt.Println(numbers)
  var num int=5
  ment := numbers[num]
  numbers = append (numbers[:num], numbers[num+1:]...)//删除
  fmt.Println(ment)
  fmt.Println(len(numbers))
  fmt.Println(numbers)
}

结果：