npm install happypack --save-dev

{
                test: /\.(js)$/,
                exclude: /node_modules/,
                use:{
                    loader: 'happypack/loader?id=1'
                }
 },

new HappyPack({
            id: "1",
            threads:4,
            loaders: ['babel-loader?cacheDirectory=true&presets[]=react,presets[]=es2015,presets[]=stage-0'],
            verbose: true
        }),

确保babel-loader参数带上支持ES6 参