4.10 go error接口的介绍

package main

import "fmt"

import "errors"

func main(){
	//方式1
	var err1 error=fmt.Errorf("%s","this is error 1")
	fmt.Println(err1)
	//方式2
	err2:=errors.New("this is err2")
	fmt.Println(err2)
	
}