go module本地包导入全过程

# 临时开启 Go modules 功能
export GO111MODULE=on
![请添加图片描述](https://img-blog.csdnimg.cn/direct/3cda800aae2041f98bef026bc274dba3.jpeg)

# 永久开启 Go modules 功能
go env -w GO111MODULE=on

# 设置 Go 的国内代理，方便下载第三方包
go env -w GOPROXY=https://goproxy.cn,direct

go env

mkdir myapp

cd myapp
go mod init myapp

package main
    
import (
    "fmt"
)

func main(){
    fmt.Println("This is main")
}

go run main.go

cd ..
mkdir mypkg
go mod init mypkg

package mypkg

import "fmt"

func SayHello()string{
    fmt.Println("hello,(print in mypkg)")
    return "success"
}

go mod edit -replace mydemo.com/mypkg=../mypkg

package main
 
import (
    "fmt"
    my "mydemo.com/mypkg"
)

func main(){
    fmt.Println("This is main")
    flag :=my.SayHello();
    fmt.Println(flag)
}

go mod tidy

go run main.go

└── twogo
    ├── myapp
    │   ├── go.mod
    │   └── main.go
    └── mypkg
        ├── go.mod
        └── hello.go