1、指针的示意图

package main

import "fmt"

func swap(pa *int,pb *int)  {

	var temp int
	temp = *pa
	*pa = *pb
	*pb = temp

}

func main()  {

	var a int   = 10
	var b int = 20
	swap(&a,&b)
	fmt.Println("a = ",a,"b = ",b)

}