b

public/react/config/webpack.config.dev.js

@@ -9,6 +9,7 @@ const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
 const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
 const eslintFormatter = require('react-dev-utils/eslintFormatter');
 const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
+const ParallelUglifyPlugin = require('webpack-parallel-uglify-plugin');
 // const MonacoWebpackPlugin = require('monaco-editor-webpack-plugin');
 const getClientEnvironment = require('./env');
 const paths = require('./paths');
@@ -249,6 +250,46 @@ module.exports = {
     // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
     // You can remove this if you don't use Moment.js:
     new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
+    new ParallelUglifyPlugin({
+      // 传递给 UglifyJS的参数如下：
+      uglifyJS: {
+        output: {
+          /*
+           是否输出可读性较强的代码，即会保留空格和制表符，默认为输出，为了达到更好的压缩效果，
+           可以设置为false
+          */
+          beautify: false,
+          /*
+           是否保留代码中的注释，默认为保留，为了达到更好的压缩效果，可以设置为false
+          */
+          comments: false
+        },
+        compress: {
+          /*
+           是否在UglifyJS删除没有用到的代码时输出警告信息，默认为输出，可以设置为false关闭这些作用
+           不大的警告
+          */
+          warnings: false,
+
+          /*
+           是否删除代码中所有的console语句，默认为不删除，开启后，会删除所有的console语句
+          */
+          drop_console: true,
+
+          /*
+           是否内嵌虽然已经定义了，但是只用到一次的变量，比如将 var x = 1; y = x, 转换成 y = 5, 默认为不
+           转换，为了达到更好的压缩效果，可以设置为false
+          */
+          collapse_vars: true,
+
+          /*
+           是否提取出现了多次但是没有定义成变量去引用的静态值，比如将 x = 'xxx'; y = 'xxx'  转换成
+           var a = 'xxxx'; x = a; y = a; 默认为不转换，为了达到更好的压缩效果，可以设置为false
+          */
+          reduce_vars: true
+        }
+      }
+    }),
   ],
   // Some libraries import Node modules but don't use them in the browser.
   // Tell Webpack to provide empty mocks for them so importing them works.

public/react/config/webpack.config.prod.js

@@ -10,6 +10,8 @@ const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
 const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin');
 const eslintFormatter = require('react-dev-utils/eslintFormatter');
 const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
+const ParallelUglifyPlugin = require('webpack-parallel-uglify-plugin');
+
 const paths = require('./paths');
 const getClientEnvironment = require('./env');
 
@@ -270,25 +272,39 @@ module.exports = {
     // Otherwise React will be compiled in the very slow development mode.
     new webpack.DefinePlugin(env.stringified),
     // Minify the code.
-    new webpack.optimize.UglifyJsPlugin({
-      compress: {
+    // new webpack.optimize.UglifyJsPlugin({
+    //   compress: {
+    //     warnings: false,
+    //     // Disabled because of an issue with Uglify breaking seemingly valid code:
+    //     // https://github.com/facebookincubator/create-react-app/issues/2376
+    //     // Pending further investigation:
+    //     // https://github.com/mishoo/UglifyJS2/issues/2011
+    //     comparisons: false,
+    //   },
+    //   mangle: {
+    //     safari10: true,
+    //   },
+    //   output: {
+    //     comments: false,
+    //     // Turned on because emoji and regex is not minified properly using default
+    //     // https://github.com/facebookincubator/create-react-app/issues/2488
+    //     ascii_only: true,
+    //   },
+    //   sourceMap: shouldUseSourceMap,
+    // }),
+
+    new ParallelUglifyPlugin({
+      cacheDir: '.cache/',
+      uglifyJS:{
+        output: {
+          comments: false
+        },
         warnings: false,
-        // Disabled because of an issue with Uglify breaking seemingly valid code:
-        // https://github.com/facebookincubator/create-react-app/issues/2376
-        // Pending further investigation:
-        // https://github.com/mishoo/UglifyJS2/issues/2011
-        comparisons: false,
-      },
-      mangle: {
-        safari10: true,
-      },
-      output: {
-        comments: false,
-        // Turned on because emoji and regex is not minified properly using default
-        // https://github.com/facebookincubator/create-react-app/issues/2488
-        ascii_only: true,
-      },
-      sourceMap: shouldUseSourceMap,
+        compress: {
+          drop_debugger: true,
+          drop_console: true
+        }
+      }
     }),
     // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
     new ExtractTextPlugin({