koa 常用中间件

app.js

const koa = require("koa");
const views = require("koa-views");
const path = require("path");
const bodyParser = require("koa-bodyparser");
const static = require("koa-static");
const Router = require("koa-router");
const app = new koa();
const router = new Router();
// 加载模版引擎
app.use(views(__dirname + "/views"), {
  map: { html: "ejs" }
});

// 加载静态资源
app.use(static(path.join(__dirname, "/static")));

// 渲染模版
router.get("/", async (ctx, next) => {
  await ctx.render("index");
});
router.post("/", (ctx, next) => {
  let postData = ctx.request.body;
  ctx.body = postData;
});

app
  .use(bodyParser())
  .use(router.routes())
  .use(router.allowedMethods());

app.listen(3000);

npm i koa
npm i koa-bodyparser
npm i koa-router
npm i koa-views 
npm i koa-static