git clone https://github.com/golang/net.git $GOPATH/src/github.com/golang/net
git clone https://github.com/golang/sys.git $GOPATH/src/github.com/golang/sys
git clone https://github.com/golang/tools.git $GOPATH/src/github.com/golang/tools
将net、sys、tools三个文件夹放到$GOPATH/src/golang.org/x目录下。有疑问加站长微信联系（非本文作者）
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`单行代码`
git clone https://github.com/golang/net.git $GOPATH/src/github.com/golang/net
git clone https://github.com/golang/sys.git $GOPATH/src/github.com/golang/sys
git clone https://github.com/golang/tools.git $GOPATH/src/github.com/golang/tools
将net、sys、tools三个文件夹放到$GOPATH/src/golang.org/x目录下。