解决VSCODE安装GO插件失败问题

搭建 Go 的开发环境时，我们都需要先安装 go 的安装包，在 windows 下，会自动配置 GOPATH 环境变量。

使用 vscode 开发 go

在 vscode 中新建了一个 go 文件后，vscode 会提示安装go插件
点击install all 后，即使上网的姿势很科学，可能也会安装失败，提示

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

原因不明，但是有办法解决。
在这种情况下，我们需要 go mod 代理来安装

go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.io,direct

重新打开 vscode，点击 install all，即可安装成功