webpack提取公共模块无法生成common.js？

Question

var webpack = require('webpack');

var ExtractTextPlugin = require("extract-text-webpack-plugin");

var config = {

entry: {

'index' : ['./src/page/index/index.js'],

'login' : ['./src/page/login/index.js'],

// 'common' : ['./src/page/common/index.js'],

},

output: {

path: __dirname+'/dist',//文件存储路径

publicPath:'/dist/',//文件访问路径

// path: './dist',//文件访问路径

filename: 'js/[name].js'

},

externals: {

'jquery' : 'window.jQuery'

},

  module: {

    loaders: [

      // 编译css并自动添加css前缀

      { 

      test: /\.css$/,

      // loader: ExtractTextPlugin.extract({

         //        fallback: "style-loader",

         //        use: "css-loader"

         //        }) 

      // loader: 'style-loader!css-loader'

      loader: ExtractTextPlugin.extract("style-loader","css-loader")

      // loader: ExtractTextPlugin.extract("style-loader","css-loader","postcss-loader","less-loader")

      // 

      // ExtractTextPlugin.extract( 

      // 'style-loader', 'css-loader',

      // {fallback : 'style-loader', 

            // use : 'css-loader',}

      // 'less-loader'

      // )

      }

    ]

  },

pulgins: [

// new webpack.optimize.CommonsChunkPlugin('common.js',['login','index']),

// 独立通用模块到js/base.js

new webpack.optimize.CommonsChunkPlugin({

name: 'common',

filename: 'js/base.js',

// chunks:['main','login','index']

}),

// new ExtractTextPlugin({

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

// }),

], 

};

module.exports = config;