gulp笔记（从开发到发布）

前言：gulp相对而言比较简单，趁有空整理出一套自己喜欢的结构来。自己想做些简单的小网站时候可以复用，代码经过测试，可以直接拿来使用。

主要实现功能：ES6转换，sass编译,合成雪碧图，css自动加前缀，压缩合并编译后的css，img图片压缩，js压缩，实施监听并刷新浏览器，以及sftp插件上传代码到服务器（未验证）

开发环境：node v8.9.4  gulp v3.9.1

目录结构：

先上package.json

{
  "name": "gulpOnly",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.26.0",
    "babel-preset-env": "^1.6.1",
    "browser-sync": "^2.23.7",
    "get-gulp-args": "0.0.1",
    "gulp": "^3.9.1",
    "gulp-autoprefixer": "^5.0.0",
    "gulp-babel": "^7.0.1",
    "gulp-clean": "^0.4.0",
    "gulp-concat": "^2.6.1",
    "gulp-css-img-sprite": "^1.0.2",
    "gulp-imagemin": "^4.1.0",
    "gulp-minify-css": "^1.2.4",
    "gulp-sass": "^4.0.1",
    "gulp-sftp": "^0.1.5",
    "run-sequence": "^2.2.1",
    "streamfilter": "^1.0.7"
  },
  "dependencies": {
    "gulp-load-plugins": "^1.5.0",
    "gulp-uglify": "^3.0.0"
  }
}

下面是gulpfile

const gulp = require('gulp');
const gulpLoadPlugins = require('gulp-load-plugins');
const plugins = gulpLoadPlugins({lazy: true});//加载package.json中的插件,仅限于gulp开头的插件
const streamfilter = require('streamfilter'); //用于过滤文件
const runSequence = require('run-sequence');//用于实现gulp同步执行
const browserSync = require('browser-sync').create(); //用于启动服务，并自动刷新
const getargs = require('get-gulp-args'); //用于得到命令行参数
const dist = 'dist'; // 发布目录
const src = 'src'; //源目录

const args = getargs(); //得到命令行传参

//服务器配置
const servers = {
    dev : {
        host: 'xx.xx.xx.dev',
        user: 'username',
        pass: 'password',
        remotePath : '/'
    },
    test : {
        host: 'xx.xx.xx.test',
        user: 'username',
        pass: 'password',
        remotePath : '/'
    }
};

let watch = function(){
    gulp.watch(src + '/**/*.html' , ['copy']); 
    gulp.watch(src + '/**/*.js' , ['babel']);
    gulp.watch(src + '/**/*.scss' , ['sass']);
    gulp.watch(src + '/image/**', ['imgMin']);
    gulp.watch([src+'/**']).on('change',browserSync.reload); 
}

gulp.task('clean', ()=>{
    return gulp.src(dist)
               .pipe(plugins.clean())
})

gulp.task('clean.html',()=>{
    return gulp
        .src([dist + '/**/*.html'])
        .pipe(plugins.clean());
});

gulp.task('clean.css',()=>{
    return gulp
        .src([dist + '/**/*.css'])
        .pipe(plugins.clean());
});

gulp.task('clean.js',()=>{
    return gulp
        .src([dist + '/**/*.js'])
        .pipe(plugins.clean());
});

gulp.task('clean.img',()=>{
    return gulp
        .src([dist + '/image/**/*'])
        .pipe(plugins.clean());
});

gulp.task('clean.slice',()=>{
    return gulp
        .src([dist + '/slice/**/*'])
        .pipe(plugins.clean());
});

gulp.task('copy',['clean'], () => {
    return gulp
        .src([src + '/**/*','!'+src+'/**/*.js','!'+src+'/**/*.scss','!'+src+'/image/**/*'])
        .pipe(gulp.dest(dist));
});
// sass编译,合成雪碧图，压缩合并编译后的css，自动加前缀
gulp.task('sass',['clean.css','clean.slice'], () => {
    return gulp
        .src([src + '/**/*.scss']) 
        .pipe(plugins.sass({outputStyle: 'expanded'})//编译sass
        .on('error', plugins.sass.logError))
        .pipe(plugins.cssImgSprite({ //合成雪碧图
            cssDesDir: dist,
            imgDesDir: dist + '/slice',
            hash: true
        }))
        .pipe(plugins.autoprefixer({ // 自动加前缀
            browsers: ['last 2 versions','Safari >0', 'Explorer >0', 'Edge >0', 'Opera >0', 'Firefox >=20'],//last 2 versions- 主流浏览器的最新两个版本
            cascade: false, //格式美化
            remove:true //是否去掉不必要的前缀 默认：true 
        }))
        .pipe(plugins.concat('main.css'))
        .pipe(plugins.minifyCss()) //压缩
        .pipe(gulp.dest(dist+'/css/'))
});

//图片压缩
gulp.task('imgMin',['clean.img'], ()=>{
    return gulp
        .src([src + '/image/*.*'])
        .pipe(plugins.imagemin(({ 
              optimizationLevel: 3, 
              progressive: true, 
              interlaced: true})
         ))
        .pipe(gulp.dest(dist+"/image"))
});

//ES6转换
gulp.task('babel',['clean.js'], () => {
    return gulp
        .src([src + '/**/*.js'])
        .pipe(plugins.babel({
            presets: ['env']
        }))
        .pipe(plugins.uglify())
        .pipe(gulp.dest(dist));
});

//启动本地服务
gulp.task('server', ()=>{
    browserSync.init({
        notify : false,
        port:9000,  //端口号
        server:{
            baseDir:['dist']//服务根目录
        }
    });
});

//上传代码到服务器
gulp.task('upload', ()=>{
    const globParams = {
        allowEmpty : false,
        base : dist
    };
    let stream = gulp.src([dist + '/**/*'], globParams);
    args.servers.split(',').forEach(serverName => {
        const server = servers[serverName];
        if(!server){
            console.warn('找不到服务器', serverName, ',只支持dev和test');
            return ;
        }

        stream = stream.pipe(plugins.sftp(server));
    });

    return stream;

});

//开发
gulp.task('dev', function(done) {
    runSequence(['copy','imgMin','sass','babel'],'server');
    watch();
});

// 发布，分为dev开发环境，test测试环境
gulp.task('deploy', function(){
    if(!args.servers){
        console.log('Usage:
gulp deploy --servers=dev,test');
        return ;
    }
    runSequence(['copy','imgMin','sass','babel'],'upload');
});