[TOC]
#### es6語法 轉換為 es2015
1. 根目錄新建 .babelrc 文件
```
{
"presets": ["es2015"]
}
```
2. 執行`cnpm i babel-core babel-preset-es2015 babel-cli`
3. package.json 修改
```
"scripts": {
"dev": "cross-env NODE\_ENV=development nodemon server/index.js --watch server --exec babel-node",
"build": "nuxt build",
"start": "cross-env NODE\_ENV=production node server/index.js --exec babel-node",
"generate": "nuxt generate"
},
```
>[danger] --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'
```
