webpack学习！lession4 安装ES6解析

一、命令行安装！

    1.一、安装webpack 4.x | babel-loader 7.x | babel 6.x

npm install -D babel-loader@7 babel-core babel-preset-env webpack

    1.二、安装

npm install babel-preset-es2015 --save-dev

    1.三、

npm install babel-preset-latest --save-dev

二、配置文件：

    2.一、webpack-dev-config.js

rules:[
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use:{
                    loader: "babel-loader",
                }
            }

 2.二、.babelrc

    

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