plugins: [

         //提取公共模块

         new webpack.optimize.CommonsChunkPlugin({

             name: 'vendors',

             chunks: Object.keys(entries),

             minChunks:

         }),

         //提取文件内容的散列

        new ExtractTextPlugin({

             filename: 'css/[name].min.css',

             allChunks: true

         })

     ]

(function (window) {

  if (window.mapStyles) {

    return;

  }

 var mapStyles = [{

       "featureType": "water",

       "elementType": "all",

       "stylers": {

         "color": "#021019"

       }

     }

   ];

  window.mapStyles = mapStyles;

})(this);