Detailed records of Koa Project Construction Process

This article describes the detailed records of the Koa project establishment process and shares them with you, as follows:

Spring MVC and MyBatis in Java have basically become the standard for Java Web. Node JS corresponds to Koa, Express, Mongoose, and sequencee. To a certain extent, Koa is an upgraded version of Express. Many Node JS projects have begun to use non-relational databases (MongoDB ). Sequencee supports non-relational databases (MSSQL, MYSQL, and SQLLite.

Koa Project Construction

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1234	cnpm install -g koa-generator // Koa2 must be used herekoa2 /foo

Introduction to common Koa Middleware

The applications generated by koa-generator already contain commonly used middleware. Here we will only describe what is not used in it.

Koa-less

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1	app.use(require('koa-less')(__dirname + '/public'))

Must be used before static, otherwise it will be invalid.

Create styles. less in the stylesheets folder and introduce all the modular less files.

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12	@import 'foo.less';@import 'bar.less';

All the examples will be compiled into a style. CSS. Use style.css in the template (pug.pdf.

Koa-session

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// Set app keys and the session will be encrypted based on thisapp.keys = ['some secret hurr'];// Configure session configconst CONFIG = {  key: 'bougie:session',  /** (string) cookie key (default is koa:sess) */  maxAge: 1000 * 60 * 60 * 24 * 7,  overwrite: true,  /** (boolean) can overwrite or not (default true) */  httpOnly: true,  /** (boolean) httpOnly or not (default true) */  signed: true,  /** (boolean) signed or not (default true) */  rolling: true,  /** (boolean) Force a session identifier cookie to be set on every response. The expiration is reset to the original maxAge, resetting the expiration countdown. (default is false) */  renew: false,  /** (boolean) renew session when session is nearly expired, so we can always keep user logged in. (default is false)*/}; // Application Middlewareapp.use(session(CONFIG, app));

This must be used before the router, otherwise it will be invalid.

It can be used as a common object.

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// Assign a valuectx.session.statu = value// Valuectx.session.statu// Deletectx.session.statu = null

Koa-proxies

Used for proxy configuration

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const proxy = require('koa-proxies')app.use(proxy('/octocat', {  target: 'https://api.github.com/users',    changeOrigin: true,  agent: new httpsProxyAgent('http://1.2.3.4:88'),  rewrite: path => path.replace(/^\/octocat(\/|\/\w+)?$/, '/vagusx'),  logs: true}))

Route Control

The development focuses on route control, including restful interfaces and template rendering.

Request)

Query parameters (? Param =)

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1	ctx.query.param

Route parameters (/: id)

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1	ctx.params.id

POST parameter (JSON or Form)

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1	ctx.request.body

Response)

Data that the server returns to the client

Restful

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1	ctx.body = yourData

Template Rendering

Starting from the views directory by default, file suffixes are not allowed.

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1	ctx.render('layout', yourData)

Route Interception

If you do not log on, the system will return 404

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const userAuth = (ctx, next) => {  let isLogin = ctx.session.isLogin  if(isLogin) return next()}router.use('/', userAuth)

This operation will be included in a route, such as "/a" and "/B". It must be used before the sub-route. Otherwise, it will be invalid.

The above is all the content of this article. I hope it will be helpful to everyone's learning, and I hope you can support your own home.