webpack ES6转ES5

安装loader：

npm --save-dev install babel-loader@7 babel-core babel-preset-es2015

{
                // ES6 转ES5 npm --save-dev install babel-loader@7 babel-core babel-preset-es2015
                test: /\.js$/,
                // 排除，不打包该文件夹下的js
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['es2015']
                    }
                }
}