您可以使用uglifycss:
uglifycss = require('gulp-uglifycss');
gulp.task('styles', function(){
return gulp.src('css/style.css')
.pipe(postcss([cssImport, mixins, cssvars, nested, hexrgba, autoprefixer]))
.on('error', function(errorInfo){
console.log(errorInfo.toString());
this.emit('end');
})
.pipe(uglifycss({
"maxLineLen": 80,
"uglyComments": true
}))
//stylesheet destination folder
.pipe(gulp.dest('dist/styles'));
});