KOA AUTHENTICATION 鉴权 基于Koa和koa生态的鉴权demo 鉴权方式：主流的jwt鉴权 参考资料： https://link.juejin.cn/?target=https%3A%2F%2Fgithub.com%2FGpingFeng%2Fjwt-koa2-demo https://juejin.cn/post/6921493257578872845 https://juejin.cn/post/6844903870116675597 http://www.ruanyifeng.com/blog/2018/07/json_web_token-tutorial.html