Merge remote-tracking branch 'origin/feature/uglify' into release/5.3

@@ -90,6 +90,7 @@
     "webpack": "^1.13.2",
     "webpack-dev-server": "^1.16.2",
     "webpack-stream": "^3.1.0",
+    "webpack-uglify-parallel": "^0.1.3",
     "yoho-cookie": "^1.2.0",
     "yoho-fastclick": "^1.0.6",
     "yoho-hammer": "^2.0.7",

@@ -10,6 +10,7 @@ const path = require('path');
 const gulp = require('gulp');
 const gutil = require('gulp-util');
 const ftp = require('gulp-ftp');
+const os = require('os');
 
 const postcss = require('gulp-postcss');
 const sourcemaps = require('gulp-sourcemaps');
@@ -19,6 +20,7 @@ const scss = require('postcss-scss');
 const webpack = require('webpack');
 const WebpackDevServer = require('webpack-dev-server');
 const ExtractTextPlugin = require('extract-text-webpack-plugin');
+const UglifyJsParallelPlugin = require('webpack-uglify-parallel');
 
 const webpackConfig = require('./webpack.config.js');
 
@@ -275,10 +277,8 @@ gulp.task('webpack', ['assets'], (done) => {
         'process.env': {
             NODE_ENV: '"production"'
         }
-    }), new webpack.optimize.UglifyJsPlugin({
-        compress: {
-            warnings: false
-        }
+    }), new UglifyJsParallelPlugin({
+        workers: os.cpus().length
     }));
 
     webpack(proConfig, (err, stats) => {