koa-useragent 快速的中间件基于公开 安装 $ npm install koa-useragent 使用概述 const koa = require ( 'koa' ) ; const app = koa . app ( ) ; const { userAgent } = require ( 'koa-useragent' ) ; app . use ( userAgent ) ; app . use ( async ( ctx , next ) { console . log ( require ( 'util' ) . inspect ( ctx . userAgent