原文来自:https://www.jianshu.com/p/5a35a67eefd7
功能描述
gulp-uglify插件用于JS文件压缩

安装命令
$ cnpm install gulp-uglify --save-dev
使用方法
例1：基本使用

var gulp = require('gulp'),
uglify = require('gulp-uglify'),
pump = require('pump');

gulp.task('jsmin', function(cb) {
pump([
gulp.src('src/js/index.js'),
uglify(),
gulp.dest('dist/js')
], cb)
});
例2：压缩多个JS文件，输出至指定目录

var gulp = require('gulp'),
uglify = require('gulp-uglify'),
pump = require('pump');

gulp.task('jsmin', function(cb) {
pump([
gulp.src(['src/js/demo1.js', 'src/js/demo2.js']),
uglify(),
gulp.dest('dist/js')
], cb)
});
例3：使用通配符“!”，“”，“*”，“{}”进行模式匹配

var gulp = require('gulp'),
uglify = require('gulp-uglify'),
pump = require('pump');

gulp.task('jsmin', function(cb) {
pump([
gulp.src(['src/js/*.js']),
uglify(),
gulp.dest('dist/js')
], cb)
});