http://www.voidcn.com/article/p-hhecpmbx-uo.html
https://www.jianshu.com/p/fa21e6fada70
所谓闭包就是一个函数“捕获”了和它在同一作用于的其他常量和变量。
package main
import "fmt"
func addNumber(x int) func(int) {
fmt.Printf("x: %d,addr of x:%p\n",x,&x)
return func(y int) {
k := x + y
x = k
y = k
fmt.Printf("x: %d,&x)
fmt.Printf("y: %d,addr of y:%p\n",y,&y)
}
}
func main() {
addNum := addNumber(5)
addNum(1)
addNum(1)
addNum(1)
fmt.Println("---------------------")
addNum1 := addNumber(5)
addNum1(1)
addNum1(1)
addNum1(1)
}
x: 5,addr of x:0xc4200140c8 x: 6,addr of x:0xc4200140c8 y: 6,addr of y:0xc420014100 x: 7,addr of x:0xc4200140c8 y: 7,addr of y:0xc420014118 x: 8,addr of x:0xc4200140c8 y: 8,addr of y:0xc420014130 --------------------- x: 5,addr of x:0xc420014148 x: 6,addr of x:0xc420014148 y: 6,addr of y:0xc420014158 x: 7,addr of x:0xc420014148 y: 7,addr of y:0xc420014170 x: 8,addr of x:0xc420014148 y: 8,addr of y:0xc420014188
