1、iota （在常量的时候，当成枚举使用）
示例1
package main
import "fmt"
func main() {
//1、iota常量自动生成器，每个一行，自动累加1
//2、iota给常量赋值使用
const (
a = iota
b = iota
c = iota
)
fmt.Printf("a = %d, b = %d, c = %d\n", a, b, c)
//3、iota遇到const，重置为0
const d = iota
fmt.Printf("d = %d\n", d)
}
#执行结果
a = 0, b = 1, c = 2 d = 0
示例2：
package main
import "fmt"
func main() {
//1、iota常量自动生成器，每个一行，自动累加1
//2、iota给常量赋值使用
const (
a1 = iota //0
b1
c1
)
fmt.Printf("a1 = %d, b1 = %d, c1 = %d\n", a1, b1, c1)
}
#执行结果
a1 = 0, b1 = 1, c1 = 2
示例3
package main
import "fmt"
func main() {
//1、iota常量自动生成器，每个一行，自动累加1
//2、iota给常量赋值使用
const (
i = iota
j1, j2, j3 = iota, iota, iota
k = iota
)
fmt.Printf("i = %d, j1 = %d, j2 = %d, j3 = %d, k = %d\n", i, j1, j2, j3, k)
}
#执行结果
i = 0, j1 = 1, j2 = 1, j3 = 1, k = 2
原文：https://www.cnblogs.com/nulige/p/10199722.html