打包速度优化

Webpack 默认提供的 UglifyJS 插件，由于采用单线程压缩，速度颇慢 ；推荐采用 webpack-parallel-uglify-plugin 插件，其做法如下，

new webpack.optimize.UglifyJsPlugin({  compress: {    warnings: false  },  sourceMap: true})

替换如上自带的 UglifyJsPlugin 写法为如下配置即可：

var ParallelUglifyPlugin = require('webpack-parallel-uglify-plugin');new ParallelUglifyPlugin({  cacheDir: '.cache/',  uglifyJS:{    output: {      comments: false    },    compress: {      warnings: false    }  }})

去掉正式环境的console.log

在压缩插件里过滤掉即可，加后的代码如下：

new ParallelUglifyPlugin({      cacheDir: '.cache/',      uglifyJS:{        output: {          comments: false        },        compress: {          warnings: false,          drop_console: true,          pure_funcs: ['console.log']        }      }    })