main.go:4:2: package lib1 is not in GOROOT (/usr/local/go/src/lib1)

├── 5-init

│ ├── lib1

│ │ └── lib1.go

│ └── lib2

│ └── lib2.go

├── const.go

├── firstVar.go

├── go.mod

├── helloGolang.go

├── main.go

└── test3function.go

1. go env

发现已经打开了go module GO111MODULE="on"

2. 建立go.mod 文件，引入项目名为module

module firstGolang

go 1.14

3. import 本地lib时，加上完整的module 路径，解决了问题

1. main.go:4:2: package 5-init/lib1 is not in GOROOT (/usr/local/go/src/5-init/lib1)

package main

import (
    "firstGolang/5-init/lib1"
    "firstGolang/5-init/lib2"
)

func main() {
    lib1.Test1()
    lib2.Test2()
}

package lib1

import "fmt"

func Test1() {
    fmt.Println("test lib1 function")
}

func init() {
    fmt.Println("init lib1....")
}

package lib2

import "fmt"

func Test2() {
    fmt.Println("test lib2 function")
}

func init() {
    fmt.Println("init lib2....")
}

4. 总结 init 和 import package顺序

init lib1....

init lib2....

test lib1 function

test lib2 function