gulp应用

gulp安装到全域环境下，可以存取gulp的CLI

将gulp安装到本地端的项目内，并在package.json内的devDependencies注册。

var gulp = require(‘gulp‘), sass = require(‘gulp-ruby-sass‘), autoprefixer = require(‘gulp-autoprefixer‘), minifycss = require(‘gulp-minify-css‘), jshint = require(‘gulp-jshint‘), uglify = require(‘gulp-uglify‘), imagemin = require(‘gulp-imagemin‘), rename = require(‘gulp-rename‘), clean = require(‘gulp-clean‘), concat = require(‘gulp-concat‘), notify = require(‘gulp-notify‘), cache = require(‘gulp-cache‘), livereload = require(‘gulp-livereload‘);

//建立一个gulpfile.js档案，载入外挂：
var gulp = require(‘gulp‘),
    sass = require(‘gulp-sass‘),
    autoprefixer = require(‘gulp-autoprefixer‘),
    minifycss = require(‘gulp-minify-css‘),
    jshint = require(‘gulp-jshint‘),
    uglify = require(‘gulp-uglify‘),
    imagemin = require(‘gulp-imagemin‘),
    rename = require(‘gulp-rename‘),
    clean = require(‘gulp-clean‘),
    concat = require(‘gulp-concat‘),
    notify = require(‘gulp-notify‘),
    cache = require(‘gulp-cache‘),
    livereload = require(‘gulp-livereload‘);

//gulp.taskAPI用来建立任务。可以透过终端机输入$ gulp styles指令来执行任务。
gulp.task(‘styles‘, function() {  
  return gulp.src(‘css/sass/pub.scss‘)
    .pipe(sass({ style: ‘expanded‘ ,}))
    .pipe(autoprefixer(‘last 2 version‘, ‘safari 5‘, ‘ie 8‘, ‘ie 9‘, ‘opera 12.1‘, ‘ios 6‘, ‘android 4‘))
    .pipe(gulp.dest(‘dist/css‘))
    .pipe(rename({suffix: ‘.min‘}))
    .pipe(minifycss())
    .pipe(gulp.dest(‘dist/css‘))
    .pipe(notify({ message: ‘Styles task complete‘ }));
});

//JSHint，拼接及缩小化JavaScript
gulp.task(‘scripts‘, function() {  
  return gulp.src(‘src/scripts/**/*.js‘)
    .pipe(jshint(‘.jshintrc‘))
    .pipe(jshint.reporter(‘default‘))
    .pipe(concat(‘main.js‘))
    .pipe(gulp.dest(‘dist/js‘))
    .pipe(rename({suffix: ‘.min‘}))
    .pipe(uglify())
    .pipe(gulp.dest(‘dist/js‘))
    .pipe(notify({ message: ‘Scripts task complete‘ }));
});

//对所有来源图片进行imagemin处理。
gulp.task(‘images‘, function() {  
  return gulp.src(‘css/img/**/*‘)
    .pipe(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true }))
    .pipe(gulp.dest(‘dist/assets/img‘))
    .pipe(notify({ message: ‘Images task complete‘ }));
});

//佈署之前，清除目的地目录并重建档案–以防任何已经被删除的来源档案遗留在目的地目录之中
gulp.task(‘clean‘, function() {  
  return gulp.src([‘dist/assets/css‘, ‘dist/assets/js‘, ‘dist/assets/img‘], {read: false})
    .pipe(clean());
});
//预设任务，当只输入$ gulp指令时执行的任务
gulp.task(‘default‘, [‘clean‘], function() {  
    gulp.start(‘styles‘, ‘scripts‘, ‘images‘);
});


//看守档案，并在更动发生后执行相关任务
gulp.task(‘watch‘, function() {

  // 看守所有.scss档
  gulp.watch(‘css/sass/*.scss‘, [‘styles‘]);

  // 看守所有.js档
 // gulp.watch(‘src/scripts/**/*.js‘, [‘scripts‘]);

  // 看守所有图片档
  gulp.watch(‘css/img/**/*‘, [‘images‘]);

//即时重整(LiveReload),Gulp处理档案更动后，自动重新整理页面。

  // 建立即时重整伺服器
  var server = livereload();

  // 看守所有位在 dist/  目录下的档案，一旦有更动，便进行重整
  gulp.watch([‘dist/**‘]).on(‘change‘, function(file) {
    server.changed(file.path);
  });

});

用 gulp +任务名 运行相应配置 用 gulp watch 监察目录变化并运行相应配置