1.首先在https://github.com/settings/developers里面建立一个新的OAuthApps
具体的格式如下：
最后一个很重要，建议Homepage URL和Authorization callback URL填写同一个，也就是你的博客地址
2.在你的github中新建一个空仓库
并且在设置中开启Issues（好像是默认开启）
3.在Hexo的_config.yml中修改gitalk配置，如下：
client_id和client_secret可以在你的OAuthApps找到：
4.然后就可以愉快的玩耍了啊
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