第一课 - 启动web服务器

.gitignore

+node_modules/
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lesson1/demo/index.js

+const koa = require('koa')
+const app = new koa()
+const router = require('./routes')
+const koaBody = require('koa-body')
+
+app.use(koaBody())
+app.use(router.routes())
+app.use(async ctx => {
+  ctx.body = 'hello world'
+})
+
+app.listen(3000)
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lesson1/demo/routes.js

+const koaRouter = require('koa-router')
+const router = new koaRouter({
+  prefix: '/api'
+})
+
+router.get('/books', async ctx => {
+  ctx.body = {
+    code: 0,
+    data: [
+      {
+        id: 1,
+        name: 'android',
+        author: 'sxx'
+      },
+      {
+        id: 2,
+        name: 'javascript',
+        author: 'likely'
+      },
+      {
+        id: 3,
+        name: 'ios',
+        author: 'sxx'
+      }
+    ],
+    msg: null
+  }
+})
+
+router.del('/books/:id', async (ctx) => {
+  const id = ctx.params.id
+  if (!id){
+    ctx.body = {
+      code: 4001,
+      data: null,
+      msg: '缺少id参数'
+    }
+  } else {
+    ctx.body = {
+      code: 0,
+      data: null,
+      msg: `成功删除id为${id}的书籍`,
+    }
+  }
+})
+
+router.post('/books', async ({request, response}) => {
+  response.body = {
+    code: 0,
+    data: request.body,
+    msg: '成功新增一本书籍'
+  }
+})
+
+router.put('/books/:id', async (ctx) => {
+  const id = ctx.params.id
+  if (!id) {
+    ctx.body = {
+      code: 4001,
+      data: null,
+      msg: '缺少id参数'
+    }
+  } else {
+    ctx.body = {
+      code: 0,
+      data: null,
+      msg: '成功修改一本书籍'
+    }
+  }
+})
+
+module.exports = router
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lesson1/demo1.js

+const http = require('http')
+
+http.createServer(function(req, res) {
+  res.end('hello world')
+}).listen(3000)
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lesson1/demo2-2.js

+const http = require('http')
+const url = require('url')
+
+http.createServer(async function(req, res) {
+  const getBody = async () => {
+    return new Promise((resolve, reject) => {
+      let body = ''
+      req.on('data', function (data) {
+        body += data
+      })
+      req.on('end', function () {
+        resolve(body)
+      })
+    })
+  }
+
+  let body 
+  if (method === 'POST') {
+    body = await getBody()
+  }
+
+  if (method === 'POST') {
+    res.end(body)
+  } else {
+    res.end('hello world')
+  }
+}).listen(3000)
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lesson1/demo2.js

+const http = require('http')
+const url = require('url')
+
+http.createServer(function(req, res) {
+  let reqUrl = req.url
+  const reqObj = url.parse(reqUrl)
+  const method = req.method
+  const pathName = reqObj.pathname
+
+  if (pathName === '/test' && method === 'GET'){
+    res.end('this is test page')
+  } else {
+    res.end('hello world')
+  }
+}).listen(3000)
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lesson1/demo3.js

+const koa = require('koa')
+const app = new koa()
+
+app.use(async ctx => {
+  ctx.body = 'hello world'
+})
+
+app.listen(3000)
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lesson1/demo4.js

+const koa = require('koa')
+const app = new koa()
+const koaRouter = require('koa-router')
+const router = new koaRouter({})
+
+
+router.get('/test', async ctx => {
+  ctx.body = 'this is test page'
+})
+
+app.use(router.routes()).use(router.allowedMethods())
+app.use(async ctx => {
+  ctx.body = 'hello world'
+})
+
+app.listen(3000)
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lesson1/package.json

+{
+  "dependencies": {
+    "koa": "^2.7.0",
+    "koa-body": "^4.1.0",
+    "koa-router": "^7.4.0"
+  }
+}