go get -u github.com/gocolly/colly/...
有些包无法下载，我们通过git来下载
git clone https://github.com/golang/net.git $GOPATH/src/golang.org/x/net
git clone https://github.com/golang/text.git $GOPATH/src/golang.org/x/text
git clone https://github.com/golang/protobuf.git $GOPATH/src/github.com/golang/protobuf
git clone https://github.com/golang/appengine.git $GOPATH/src/google.golang.org/appengine
非常好用的七牛云的国内镜像
go env -w GOPROXY=https://goproxy.cn,direct
