测试！

Hello

package main

    import "fmt"

    func main() {
      // 定义一个切片文法
      s := []int{1, 2, 3, 4, 5, 6}
      printSlice(s)
      // 定义一个切片
      s1 := s[1:3]
      printSlice(s1)
      s2 := s[4:]
      printSlice(s2)
      s3 := s[6:]
      printSlice(s3)
      s3 = append(s3, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
      printSlice(s3)
      printSlice(s)
    }
    func printSlice(s []int) { // 参数是一个切片
      fmt.Printf("len=%d cap=%d %v\n", len(s), cap(s), s)
    }