circe-on-error 错误处理 安装 使用 import * as Koa from 'koa'import OnError from 'circe-on-error' const app = new Koa() app.use(onError((err, ctx) => { ctx.status = 500 ctx.body = process.env.NODE_ENV === 'development' ? err.message : 'Internal Server Error'}))