下载包 go get

-x ：下载依赖包，并显示执行的命令

构建 go build

-n ：显示构建过程的命令，但不执行
-x ：显示执行构建的命令
-o ：构建输出可执行文件 

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go build -o app

运行

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go run .

包依赖

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go mod tidy && go mod vendor

如果遇到以下问题，则是由代码中引入的package地址与项目的git仓库不一致导致的。
例如：
代码中引入package github.com/coreos/prometheus-operator/pkg/client, 但它的git仓库是github.com/prometheus-operator/prometheus-operator/pkg/client，在执行go mod tidy则会报错：

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go: example.com/operator imports
        github.com/coreos/prometheus-operator/pkg/client/versioned: github.com/coreos/prometheus-operator/pkg/client@v0.57.0: parsing go.mod:
        module declares its path as: github.com/prometheus-operator/prometheus-operator/pkg/client
                but was required as: github.com/coreos/prometheus-operator/pkg/client

需要在当前项目中的go.mod中添加replace

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module example.com

go 1.18

replace github.com/coreos/prometheus-operator/pkg/client => github.com/prometheus-operator/prometheus-operator/pkg/client v0.57.0

或者执行

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go mod edit -replace github.com/coreos/prometheus-operator/pkg/client=github.com/prometheus-operator/prometheus-operator/pkg/client@v0.57.0

展示包下的函数 go doc

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go doc net/http
go doc fmt.Printf

Go 升级

下载最新版GO:The Go Programming Language

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$ go env GOROOT
/usr/local/go
## 将下载文件解压，替换GOROO文件夹内容