koa2

let Koa = require('koa');

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

let bodyParser = require('koa-bodyparser');

let app = new Koa();

// 異步函數

app.use(async (ctx,next)=>{

console.log(`${ctx.request.method}~~~~${ctx.request.url}`);

await next();

});

app.use(async (ctx,next)=>{

let start = new Date().getTime();

await next();

const ms = new Date().getTime() - start; // 耗費時間

console.log(`Time: ${ms}ms`); // 打印耗費時間

});

app.use(async (ctx, next) => {

await next();

ctx.response.type = 'text/html';

ctx.response.body = '<h1>Hello wrod!!!</h1>'

});

// 接口請求（辦法愚蠢）

app.use(async (ctx, next) => {

if (ctx.request.path === '/') {

ctx.response.type = 'text/html'

ctx.response.body = 'index page !!!!!!!!!'

}else{

await next();

}

});

app.use(async (ctx, next) => {

if (ctx.request.path === '/list') {

ctx.response.type = 'text/html'

ctx.response.body = '<ul><li>1</li><li>2</li><li>3</li></ul>'

} else {

await next();

}

});

app.use(async (ctx, next) => {

if (ctx.request.path === '/error') {

ctx.response.type = 'text/html'

ctx.response.body = 'notfund 404 哥們你找錯人了吧'

} else {

await next();

}

});

// 接口請求 （路由）router

app.use(async (ctx, next) => {

console.log(`Process ${ctx.request.method} ${ctx.request.url}...`);

await next();

});

router.get('/',async (ctx,next) =>{

ctx.response.body = '<h1>Index</h1>';

});

router.get('/hello/:name', async (ctx, next) => {

var name = ctx.params.name;

ctx.response.body = `<h1>Hello, ${name}!</h1>`

});

// 模擬登錄接口

// bodyParser 解析post數據

app.use(bodyParser());

router.get('/', async (ctx, next) => {

ctx.response.body = `<h1>Index</h1>

<form action="/signin" method="post">

<p>Name: <input name="name" value="koa"></p>

<p>Password: <input name="password" type="password"></p>

<p><input type="submit" value="Submit"></p>

</form>`;

});

router.post('/signin',async (ctx,next) => {

var name = ctx.request.body.name || '',

password = ctx.request.body.password || '';

console.log(`signin with name: ${name}, password: ${password}`);

if (name === 'koa' && password === '12345') {

ctx.response.body = `<h1>Welcome, ${name}!</h1>`;

} else {

ctx.response.body = `<h1>Login failed!</h1>

<p><a href="/">Try again</a></p>`;

}

});

app.use(router.routes());

app.listen(9696);

console.log('app started at port 3000...')