npm init -y

npm install koa -S

// app.js

const Koa = require('koa');
const app = new Koa();

app.use(async ctx => {
 ctx.body = 'Wise Wrong';
});

app.listen(3000);

npm install koa-generator -g

koa2 project_name

// app.js// 原生路由

const Koa = require('koa');
const fs = require('fs');
const app = new Koa();

app.use(async (ctx, next) => {
 if (ctx.request.path === '/index') {
 ctx.type = 'text/html';
 ctx.body = fs.createReadStream('./views/index.html');
 } else {
 await next();
 }
});

app.listen(3000);

npm install koa-router -S

const router = require('koa-router')();

const koaRouter = require('koa-router');
const router = koaRouter();

// routes/index.js

const fs = require('fs');
const router = require('koa-router')()

router.get('/index', async (ctx, next) => {
 ctx.type = 'text/html';
 ctx.body = fs.createReadStream('./views/index.html');
});

module.exports = router

// app.js

const Koa = require('koa');
const app = new Koa();

const index = require('./routes/index')
app.use(index.routes(), index.allowedMethods())

app.listen(3000);

router.get('/about/:name', async (ctx, next) => {
 ctx.body = `I am ${ctx.params.name}!`;
});

npm install koa-static -S

const static = require('koa-static');
// 將 public 目錄設(shè)置為靜態(tài)資源目錄
const main = static(__dirname + '/public');
app.use(main);

app.use(require('koa-static')(__dirname + '/public'));

npm install koa-views -S

const views = require('koa-views')
app.use(views(__dirname + '/views'));

// routes/index.js

const router = require('koa-router')()

router.get('/index', async (ctx, next) => {
 await ctx.render('index');
});

module.exports = router

app.use(views(__dirname + '/views', {
 extension: 'pug' // 以 pug 模版為例
}))