go的默认安装路径是 /usr/local/go
编辑
vim ~/.bash_profile
配置参数
export GOROOT=/usr/local/go export GOPATH=/Users/wangteng/go export GOBIN=$GOROOT/bin export PATH=$PATH:$GOBIN
配置生效
source ~/.bash_profile
wangtengdeMacBook-Pro:go wangteng$ go env //查看环境
GO111MODULE=""