Golang Hello installation environment exception [resolved]

Abnormal information

Initial installation go Environmental Science -hello

go: go.mod file not found in current directory or any parent directory; see 'go help modules'

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Cause analysis ：

go The problem of environment configuration of . And golang Package management for .

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Solution ：

If you are Windows System , Shortcut key “Win+R”, Input cmd, Open the terminal . Input ：

go env -w GO111MODULE=auto

explain ：

GO111MODULE yes Go 1.11 The new version of module management mode introduced .

GO111MODULE Environment variables are used to turn on or off Go Modules in the language support , It has off、on、auto Three options , The default is auto.

1. GO111MODULE=off

   No module support ,go From $GOPATH The folder and vendor Find dependencies in directory .

2. GO111MODULE=on

   Module support ,go Ignore $GOPATH Folder , Based on go.mod Download dependency .

3. GO111MODULE=auto

   stay $GOPATH/src Outer layer and root directory has go.mod When you file , Enable module support ; No, no module support .