# 路由使用装饰器改造 步骤 1. 在 index.js 调用中间件 /server/middleware/router.js 2. 执行 router.js 的 router 方法 1. 将 /server/routes/ 赋值给 apiPath 2. 实例化 /server/lib/decorator 的 Route，将传入的参数app、apiPath赋值给类属性，实例化koa-router 3. 调用 Route 的 init 方法 1. 导入 apiPath（即routes） 目录下的所有 js 文件 1. 执行controller修饰符，在Controller的prototype属性创建唯一属性symbolPrefix，值为将传入的路径参数 2. 执行get post修饰符，修饰Controller的方法，执行router函数 3. 在routerMap添加键值对，如键为{target: movieController,method:'get',path: '/'}，值为getMovies函数 2. 遍历 routerMap，获取conf, controller属性 1. 将controllers转化为数组 2. 若路径前缀存在，与配置中的path拼接为routerPath 3. 调用 koa实例的 router[method](routerPath, ...controllers) ## index.js 导入 middleware文件夹内MIDDLEWARES数组的文件 ``` const R = require('ramda') const MIDDLEWARES = ['router'] const useMiddlewares = (app) => { R.map( R.compose( R.forEachObjIndexed( initWith => initWith(app) ), require, name => resolve(__dirname, `./middleware/${name}`) ) )(MIDDLEWARES) } ;(async() => { await connect() const app = new Koa() await useMiddlewares(app) app.listen(8888) })() ``` ## middleware/router.js 以app和routes目录路径为参数，初始化decorator ``` const {resolve} = require('path') const {Route} = require('../lib/decorator') export const router = app => { const apiPath = resolve(__dirname, '../routes') const router = new Route(app, apiPath) router.init() } ``` ## routes\movie.js ``` const { controller, get } = require('../lib/decorator') const { getAllMovies, getMovieDetail, getRelativeMovies } = require('../service/movie') @controller('/api/v0/movies') export class movieController { @get('/') async getMovies (ctx, next) { const { type, year } = ctx.query const movies = await getAllMovies(type, year) ctx.body = { success: true, data: movies } } @get('/:id') async getMovieDetail (ctx, next) { const id = ctx.params.id const movie = await getMovieDetail(id) const relativeMovies = await getRelativeMovies(movie) ctx.body = { data: { movie, relativeMovies }, success: true } } } ```