npm install --save-dev gulp-minify-css
			
			

			
// including plugins
var gulp = require('gulp');
var minifyCss = require("gulp-minify-css");
 
// task
gulp.task('minify-css', function () {
    gulp.src('./css/one.css') // path to your file
    .pipe(minifyCss())
    .pipe(gulp.dest('path/to/destination'));
});

// task
gulp.task('minify-multi-css', function () {
    gulp.src(__dirname+'/css/*.css') // path to your file
    .pipe(minifyCss())
    .pipe(gulp.dest('path/to/destination'));
});
			
			

			
gulp minify-css
gulp minify-multi-css
			
			

			
var gulp = require('gulp');
var minifycss = require('gulp-clean-css');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');

gulp.task('minify-css', function () {

        gulp.src('./css/*.css')
        .pipe(concat("finally.css"))
        .pipe(rename({ suffix: '.min' }))
        .pipe(minifycss())
        .pipe(gulp.dest('build/css'));

});

gulp.task('minify-js', function(){

        gulp.src(__dirname + "/js/*.js")
        .pipe(concat("finally.js"))
        .pipe(rename({ suffix: '.min' }))
        .pipe(uglify())
        .pipe(gulp.dest('build/js'))

});
			
			

compatibility

			
var gulp = require('gulp');
var cleanCSS = require('gulp-clean-css');
 
gulp.task('minify-css', function() {
  return gulp.src('styles/*.css')
    .pipe(cleanCSS({compatibility: 'ie8'}))
    .pipe(gulp.dest('dist'));
});			
			
			

callback

			
var gulp = require('gulp');
var cleanCSS = require('gulp-clean-css');
 
gulp.task('minify-css', function() {
    return gulp.src('styles/*.css')
        .pipe(cleanCSS({debug: true}, function(details) {
            console.log(details.name + ': ' + details.stats.originalSize);
            console.log(details.name + ': ' + details.stats.minifiedSize);
        }))
        .pipe(gulp.dest('dist'));
});			
			
			

给css文件里引用url加版本号（md5sum），像这样：

			
background: url(../images/pc-banner-bg.jpg?v=4facbd0914639f296faec4dba4d358f0) no-repeat;}
			
			

			
npm install --save-dev gulp-make-css-url-version 
						
			

			
var gulp = require('gulp'),
minifier = require('gulp-minify-css');
cssver = require('gulp-make-css-url-version'); 
 
gulp.task('testCssmin', function () {
    gulp.src('src/css/*.css')
        .pipe(cssver()) //给css文件里引用文件加版本号（文件MD5）
        .pipe(minifier())
        .pipe(gulp.dest('dist/css'));
});			
			
			

检查出重复定义的CSS

Installation

			
npm install gulp-csscss --save-dev			
			
			

Example

			
var gulp = require('gulp');
var csscss = require('gulp-csscss');
 
gulp.task('default', function() {
  gulp.src('src/style.css')
    .pipe(csscss())
});