go闭包示例

n会累加，相当于是一个全局变量

package main

import (
  "fmt"
)

func AddUpper() func (int) int {
  var n int = 10
  return func (x int) int {
    n = n + x
    return n
  }
}

func main(){
  method := AddUpper()
  fmt.Println(method(1))//11
  fmt.Println(method(2))//13
  fmt.Println(method(3))//16
}