feat(koa): 大幅新增Koa框架教程、文档

Author: 142vip.cn

README.md

@@ -2,7 +2,7 @@
 
 <div align="center">
   <img alt="JavaScriptCollection"  src="https://cdn.statically.io/gh/142vip/cdn_service@main/doc_book/jsc/jsc_logo.png" style="text-align: center;">
-<p style="font-size: 30px"><strong>✨【理论+实战】保姆级成长笔记✨</strong></p>
+<p style="font-size: 20px"><strong>✨【理论+实战】保姆级成长笔记✨</strong></p>
 </div>
 
 <div align="center">

code/koa/http-status.txt

@@ -0,0 +1,58 @@
+- 100 "continue"
+- 101 "switching protocols"
+- 102 "processing"
+- 200 "ok"
+- 201 "created"
+- 202 "accepted"
+- 203 "non-authoritative information"
+- 204 "no content"
+- 205 "reset content"
+- 206 "partial content"
+- 207 "multi-status"
+- 208 "already reported"
+- 226 "im used"
+- 300 "multiple choices"
+- 301 "moved permanently"
+- 302 "found"
+- 303 "see other"
+- 304 "not modified"
+- 305 "use proxy"
+- 307 "temporary redirect"
+- 308 "permanent redirect"
+- 400 "bad request"
+- 401 "unauthorized"
+- 402 "payment required"
+- 403 "forbidden"
+- 404 "not found"
+- 405 "method not allowed"
+- 406 "not acceptable"
+- 407 "proxy authentication required"
+- 408 "request timeout"
+- 409 "conflict"
+- 410 "gone"
+- 411 "length required"
+- 412 "precondition failed"
+- 413 "payload too large"
+- 414 "uri too long"
+- 415 "unsupported media type"
+- 416 "range not satisfiable"
+- 417 "expectation failed"
+- 418 "I'm a teapot"
+- 422 "unprocessable entity"
+- 423 "locked"
+- 424 "failed dependency"
+- 426 "upgrade required"
+- 428 "precondition required"
+- 429 "too many requests"
+- 431 "request header fields too large"
+- 500 "internal server error"
+- 501 "not implemented"
+- 502 "bad gateway"
+- 503 "service unavailable"
+- 504 "gateway timeout"
+- 505 "http version not supported"
+- 506 "variant also negotiates"
+- 507 "insufficient storage"
+- 508 "loop detected"
+- 510 "not extended"
+- 511 "network authentication required"

code/koa/koa-app.js

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+const Koa = require('koa')
+
+// 利用构造函数修改属性
+const app1 = new Koa({ proxy: true })
+console.log(app1)
+
+
+// 定义创建完动态修改属性
+const app2 = new Koa()
+app2.proxy = true
+console.log(app2)

code/koa/koa-context.js

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+const Koa = require('koa')
+const app = new Koa()
+app.use(async(ctx, next) => {
+  // Context对象
+  console.log(ctx)
+  // Koa的Request对象
+  console.log(ctx.request)
+  // Koa的Response对象
+  console.log(ctx.response)
+
+  await next()
+})
+
+app.use(ctx => {
+  // ctx.app是对app的引用
+  console.log(ctx.app === app)
+  ctx.cookies.set()
+  ctx.throw(400)
+  ctx.throw(400, '参数错误')
+  ctx.throw(400, '参数错误', { message: '缺少必要参数' })
+
+  ctx.assert()
+})
+
+
+app.use(async(ctx, next) => {
+  ctx.body = 'hello world'
+  ctx.status = 200
+  ctx.res.statusCode = 500
+})
+
+
+app.listen(8000)
+console.log('listening on port 8000')

code/koa/koa-listen.js

@@ -0,0 +1,15 @@
+const Koa = require('koa')
+const app = new Koa()
+// 监听服务端端口3000
+app.listen(3000)
+
+
+// 语法糖实现
+const http = require('http')
+const server = http.createServer(app.callback())
+// 监听端口
+server.listen(3000)
+
+const https = require('https')
+const httpsServer = https.createServer(app.callback())
+httpsServer.listen(6000)

code/koa/koa-request.js

@@ -0,0 +1,12 @@
+const Koa = require('koa')
+const app = new Koa()
+
+app.use(async(ctx, next) => {
+  ctx.request.header = {
+    reference: 'https://code.142vip.cn'
+  }
+  await next()
+})
+
+app.listen(6000)
+console.log('listening on port 6000')

code/koa/koa-response.js

@@ -0,0 +1,17 @@
+const minify = require('html-minifier')
+const Koa = require('koa')
+const app = new Koa()
+app.use(async(ctx, next) => {
+  await next()
+
+  if (!ctx.response.is('html')) return
+
+  let body = ctx.body
+  if (!body || body.pipe) return
+
+  if (Buffer.isBuffer(body)) body = body.toString()
+  ctx.body = minify(body)
+})
+
+app.listen(7000)
+console.log('listening on port 7000')

code/koa/koa-start.js

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+const Koa = require('koa')
+const app = new Koa()
+
+app.use(async ctx => {
+  ctx.body = 'Hello World'
+})
+
+app.listen(3000)