GOROOT&GOPATH设置
vim ~/.bash_profile
export GOROOT=/usr/local/go
export PATH=$PATH:$GOROOT/bin
export GOPATH=/golang/code
export PATH=$PATH:$GOPATH/bin
source ~/.bash_profile
vim ~/.bash_profile
export GOROOT=/usr/local/go
export PATH=$PATH:$GOROOT/bin
export GOPATH=/golang/code
export PATH=$PATH:$GOPATH/bin
source ~/.bash_profile