2. cmd/go: cannot find main module root; see ‘go help modules’

1. 使用vscode编写go时，无法安装系统推荐模块

Installing github.com/mdempsky/gocode FAILED
Installing github.com/uudashr/gopkgs/v2/cmd/gopkgs FAILED
Installing github.com/ramya-rao-a/go-outline FAILED
Installing github.com/acroca/go-symbols FAILED
Installing golang.org/x/tools/cmd/guru FAILED
Installing golang.org/x/tools/cmd/gorename FAILED
Installing github.com/cweill/gotests/… FAILED
Installing github.com/fatih/gomodifytags FAILED
Installing github.com/josharian/impl FAILED
Installing github.com/davidrjenni/reftools/cmd/fillstruct FAILED
Installing github.com/haya14busa/goplay/cmd/goplay FAILED
Installing github.com/godoctor/godoctor FAILED
Installing github.com/go-delve/delve/cmd/dlv FAILED
Installing github.com/stamblerre/gocode FAILED
Installing github.com/rogpeppe/godef FAILED
Installing github.com/sqs/goreturns FAILED
Installing golang.org/x/lint/golint FAILED

解决办法如下:
https://goproxy.io/zh/

2. cmd/go: cannot find main module root; see ‘go help modules’

cmd/go: cannot find main module root; see ‘go help modules’

解决办法：

go env -w GO111MODULE=off