準備下載一個gin框架，執行go get報錯如下

PS D:\work\10_Git\pulse-src> go get -u github.com/gin-gonic/gin
go: go.mod file not found in current directory or any parent directory.
        'go get' is no longer supported outside a module.
        To build and install a command, use 'go install' with a version,
        like 
 
'go install example.com/cmd@latest'
        For more information, see https://golang.org/doc/go-get-install-deprecation
        or run 'go help get' or 'go help install'.
go: cannot find main module, but found .git/config in D:\work\10_Git\pulse-src
        to create a module there, run:
        go mod init
 

官方說字1.17之後，不應該用go get下載安裝命令（即可執行程式），如果使用goget安裝命令，就會提示上述警告，

也就是說go get只能下載普通的包，如果下載安裝程式需要用go install

PS D:\work\10_Git\pulse-src> go install github.com/gin-gonic/gin@v1.7.7
go: downloading github.com/gin-gonic/gin v1.7.7
go: downloading github.com/gin-contrib/sse v0.1.0
go: downloading github.com/mattn/go-isatty v0.0.12
 

go: downloading github.com/golang/protobuf v1.3.3
go: downloading github.com/ugorji/go/codec v1.1.7
go: downloading gopkg.in/yaml.v2 v2.2.8
go: downloading github.com/go-playground/validator/v10 v10.4.1
go: downloading golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
go: downloading github.com/go-playground/universal-translator v0.17.0
go: downloading github.com/leodido/go-urn v1.2.0
go: downloading github.com/ugorji/go v1.1.7
go: downloading github.com/go-playground/locales v0.13.0
package github.com/gin-gonic/gin is not a main package
PS D:\work\10_Git\pulse-src>