由于众所周知的原因，Google软件的全家都无法访问，或者太慢了。
Go语言也一样，一句go get之后就是无尽的等待，关键它也没有进度条。
就像几年前开发安卓SDK需要从大学或科研所下载。
也像现在Github都慢到爆——有一种1994年刚通网用56kbps的猫的感觉。
幸好我们有国内的代理，就像YUM或者Maven等等一样。
所以我们可以选择用：>>阿里云Go Module代理仓库服务<<
步骤1：设置GOPROXY
设置环境变量。
export GOPROXY=https://mirrors.aliyun.com/goproxy/
或者Windows下编辑系统环境变量（换用户环境变量需要重新登录哦）。
步骤2：go mod
进入你的go工程目录，命令行执行：
> go mod init <ProjectDIR>
编辑你的源代码，加入依赖的包：
package main
import (
"archive/tar"
"archive/zip"
"bufio"
"bytes"
"compress/gzip"
"compress/lzw"
"fmt"
"github.com/mholt/archiver/v3"
"golang.org/x/text/encoding/simplifiedchinese"
"golang.org/x/text/transform"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
执行它：
> go run unPack.go
稍等片刻（而不是一辈子），依赖的包就都下载好了，程序也正常执行了。
当然你还可以用其它指令参数看看：
> go mod verify #确认依赖关系
all modules verified
>go mod why #谁在用这些依赖
# unPack
unPack
> go mod graph #画出依赖关系
unPack github.com/mholt/archiver/[email protected]
unPack golang.org/x/[email protected]
golang.org/x/[email protected] golang.org/x/[email protected]
github.com/mholt/archiver/[email protected] github.com/andybalholm/[email protected]
github.com/mholt/archiver/[email protected] github.com/dsnet/[email protected]
github.com/mholt/archiver/[email protected] github.com/golang/[email protected]
github.com/mholt/archiver/[email protected] github.com/google/[email protected]
github.com/mholt/archiver/[email protected] github.com/klauspost/[email protected]
github.com/mholt/archiver/[email protected] github.com/klauspost/[email protected]
github.com/mholt/archiver/[email protected] github.com/nwaples/[email protected]
github.com/mholt/archiver/[email protected] github.com/pierrec/[email protected]+incompatible
github.com/mholt/archiver/[email protected] github.com/ulikunitz/[email protected]
github.com/mholt/archiver/[email protected] github.com/xi2/[email protected]
github.com/andybalholm/[email protected] github.com/golang/[email protected]
github.com/dsnet/[email protected] github.com/dsnet/[email protected]
github.com/dsnet/[email protected] github.com/klauspost/[email protected]
github.com/dsnet/[email protected] github.com/klauspost/[email protected]
github.com/dsnet/[email protected] github.com/ulikunitz/[email protected]