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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                [TOC] ### 初始化項目 `yarn init` ### 安裝Koa2 `yarn add koa` ### 編寫HelloWorld ``` import Koa from 'koa'; const app = new Koa(); app.use(ctx=> { ctx.body = 'hello! 222world' }) app.listen(3000) ``` ### 自動重啟 `yarn add nodemon --dev` // nodemon 只在開發環境運行,上線不需要 package.json 中加入以下代碼: ``` "scripts": { "start": "nodemon index.js --watch server --exec babel-node" }, ``` >[danger] --watch server --exec babel-node es6語法轉換,可以在koa中使用es6模塊化 ### 語法轉換 1. 根目錄新建 .babelrc 文件 ~~~ { "presets": ["es2015"] } ~~~ 2. 執行`yarn add babel-core babel-preset-es2015 babel-cli --dev` 3. package.json 修改 ``` "scripts": { "start": "nodemon index.js --watch server --exec babel-node" }, ``` > --exec babel-node 轉換成es2015語法 4. 這樣在koa中就可以用es6模塊導入類庫了 ~~~ import Koa from 'koa' ~~~
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