ES学习笔记(1)--环境搭建

目录结构

index.html

src/index.js

let a = 1;
console.log(a);

安装依赖

npm init -y
cnpm install -g babel-cli
cnpm install --save-dev babel-preset-es2015 babel-cli

新建.babelrc

{
    "presets":[
        "es2015"
    ],
    "plugins":[]
}

运行转化

babel src/index.js -o dist/index.js

dist/index.js

"use strict";

var a = 1;
console.log(a);

运行index.html

简化打包命令//package.json

  "scripts": {
    "build": "babel src/index.js -o dist/index.js"
  },

直接运行

npm run build