'godoc' is not recognized as an internal or external command,
operable program or batch file.
原因：这是因为Windows的系统变量没有配置好GOPATH
解决：
有2种方法可以解决：
第一种是变通的方法：使用godoc的完整路径
每次运行godoc都带上gopath的完整路径，假设你的GOPATH根目录是C:\Users\fastb\go\bin，你可以使用C:\Users\fastb\go\bin\godoc.exe执行godoc
第二种方法（推荐）：把GOPATH添加到Path环境变量
首先，请确保已经设置好了GOPATH，然后把%GOPATH%\bin加到系统环境变量的Path变量，重新打开cmd命令行窗口，再次执行godoc就可以了
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