go开发环境安装和小知识

按照如下地址安装go开发环境：
https://developer.aliyun.com/article/1215978

如果提示：“A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.”，可以按照如下网址添加代理：https://blog.csdn.net/xiaobinqt/article/details/115822624

go env -w GOPROXY=https://goproxy.cn

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如下语句中，"“用来忽略返回的键索引值，roi用来接收返回的键值。在go中”"是合法的变量名。

for _, roi := range rois
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