# 建立一个文件 test.go [root@sltvb7v2wy3 jia_uuid]# cat test.go package main import ( "fmt" "github.com/gofrs/uuid" ) func main() { uuid, _ := uuid.NewV4() fmt.Println("uuid: ", uuid) } # 尝试运行 test.go, 提示缺少安装包 uuid. go.mod 也不存在 [root@sltvb7v2wy3 jia_uuid]# go run test.go test.go:6:1: no required module provides package github.com/gofrs/uuid: go.mod file not found in current directory or any parent directory; see 'go help modules' # 使用 go mod init <module> 生成go.mod 文件 [root@sltvb7v2wy3 jia_uuid]# go mod init example/uuid go: creating new go.mod: module example/uuid go: to add module requirements and sums: go mod tidy # 可以看到本地生成了 go.mod 文件 [root@sltvb7v2wy3 jia_uuid]# ls go.mod test.go # 查看 go.mod 文件 [root@sltvb7v2wy3 jia_uuid]# cat go.mod module example/uuid go 1.19 # 尝试执行test.go, 提示需要安装包 [root@sltvb7v2wy3 jia_uuid]# go run test.go test.go:6:1: no required module provides package github.com/gofrs/uuid; to add it: go get github.com/gofrs/uuid # 按照提示，安装 uuid 包 [root@sltvb7v2wy3 jia_uuid]# go get github.com/gofrs/uuid go: downloading github.com/gofrs/uuid v4.3.1+incompatible go: added github.com/gofrs/uuid v4.3.1+incompatible # 查看文件，本地生成 go.mod [root@sltvb7v2wy3 jia_uuid]# ll total 12 -rw-r--r-- 1 root root 92 Dec 6 15:46 go.mod -rw-r--r-- 1 root root 187 Dec 6 15:46 go.sum -rw-r--r-- 1 root root 133 Dec 6 15:40 test.go # 查看此时的go.sum [root@sltvb7v2wy3 jia_uuid]# cat go.sum github.com/gofrs/uuid v4.3.1+incompatible h1:0/KbAdpx3UXAx1kEOWHJeOkpbgRFGHVgv+CFIY7dBJI= github.com/gofrs/uuid v4.3.1+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM= # 查看此时的go.mod [root@sltvb7v2wy3 jia_uuid]# cat go.mod module example/uuid go 1.19 require github.com/gofrs/uuid v4.3.1+incompatible // indirect # 再次运行test.go, uuid 生成 [root@sltvb7v2wy3 jia_uuid]# go run test.go uuid: d31c22bc-e5ea-4857-8208-3b61a7fc4c42