babel解析react以及es2015相关配置的两种方式

1、.babelrc中配置

{
    "presets": ["es2015"]
}

2、在webpack.config配置文件中配置

 loaders: [
            {
                test: /\.js?$/,
                loaders: ["react-hot-loader/webpack",'babel-loader?presets[]=react,presets[]=es2015'],
                exclude: /node_modules/
            },

            {
                test: /\.less$/,
                loader: "style!css!less"
            }
        ]