go中的iota关键字

package main

import "fmt"

func main() {
   const (
      A = iota //0
      B        //1
      C      //2
      D = "haha" //3
      E        //4
      F      //5
      G = iota //6
   )
   const (
      H = iota //0
   )
   fmt.Println(A)
   fmt.Println(B)
   fmt.Println(C)
   fmt.Println(D)
   fmt.Println(E)
   fmt.Println(F)
   fmt.Println(G)
   fmt.Println(H)
}

输出:

0
1
2
haha
haha
haha
6
0