src('./js/*.js')               // * 匹配js文件夹下所有.js格式的文件
src('./js/**/*.js')            // ** 匹配js文件夹的0个或多个子文件夹
src(['./js/*.js','!./js/index.js'])    // ! 匹配除了index.js之外的所有js文件
src('./js/**/{omui,common}.js')        // {} 匹配{}里的文件名

const del = require('del');

del('./dist');                      // 删除整个dist文件夹

const { src, dest } = require('gulp');
const rename = require("gulp-rename");

const renameTask = cb => {
    src('./hello.txt')
        .pipe(rename('gb/goodbye.md'))    // 直接修改文件名和路径
        .pipe(dest('./dist')); 
    cb();
}
const optionTask = cb => {
    src('./hello.txt')
        .pipe(rename({
            dirname: "text",                // 路径名
            basename: "goodbye",            // 主文件名
            prefix: "pre-",                 // 前缀
            suffix: "-min",                 // 后缀
            extname: ".html"                // 扩展名
        }))
        .pipe(dest('./dist'));
    cb();
}

const { src, dest } = require('gulp');
const concat = require('gulp-concat');

const concatTask = cb => {
    src('./js/*.js')
        .pipe(concat('all.js'))         // 合并all.js文件
        .pipe(dest('./dist'));
    cb();
}

const { src, dest } = require('gulp');
const filter = require('gulp-filter');

const f = filter(['**', '!*/index.js']);
const fTask = cb => {
    src('js/**/*.js')
        .pipe(f)                        // 过滤掉index.js这个文件
        .pipe(dest('dist'));
    cb();
}

const f1 = filter(['**', '!*/index.js'], {restore: true});
const f1Task = cb => {
    src('js/**/*.js')
        .pipe(f1)                       // 过滤掉index.js这个文件
        .pipe(uglify())                 // 对其他文件进行压缩
        .pipe(f1.restore)               // 返回到未过滤执行的所有文件
        .pipe(dest('dist'));       // 再对所有文件操作，包括index.js
    cb();
}

const { src, dest } = require('gulp');
const uglify = require("gulp-uglify");

const uglifypTask = cb => {
    src('./hello.js')
        .pipe(uglify())                 // 直接压缩hello.js
        .pipe(dest('./dist'))
    cb();
}

const optionpTask = cb => {
    src('./hello.js')
        .pipe(uglify({
            mangle: true,               // 是否修改变量名，默认为 true
            compress: true,             // 是否完全压缩，默认为 true
            preserveComments: 'all'     // 保留所有注释
        }))
        .pipe(dest('./dist'))
    cb();
}

const { src, dest } = require('gulp');
const csso = require('gulp-csso');

const cssopTask = cb => {
    src('./css/*.css')
        .pipe(csso())
        .pipe(dest('./dist/css'))
    cb();
}

const { src, dest } = require('gulp');
const htmlmini = require('gulp-htmlmin');

const minpTask = cb => {
    src('index.html')
        .pipe(htmlmini())
        .pipe(dest('./dist'))
    cb();
}

const { src, dest } = require('gulp');
const imagemin = require('gulp-imagemin');

const minpTask = cb => {
    src('./img/*.{jpg,png,gif,ico}')
        .pipe(imagemin())
        .pipe(dest('./dist/img'))
    cb();
}

const { src, dest } = require('gulp');
const zip = require('gulp-zip');

const zipTask = cb => {
    src('./src/*')
        .pipe(zip('all.zip'))                   // 压缩成all.zip文件
        .pipe(dest('./dist'))
    cb();
}

const { src, dest } = require('gulp');
const autoprefixer = require('gulp-autoprefixer');

const prefTask = cb => {
    src('./css/*.css')
        .pipe(autoprefixer())           // 直接添加前缀
        .pipe(dest('dist'))
    cb();
}
const optionTask = cb => {
    src('./css/*.css')
        .pipe(autoprefixer({
            browsers: ['last 2 versions'],      // 浏览器版本
            cascade：true                       // 美化属性，默认true
            add: true                           // 是否添加前缀，默认true
            remove: true                        // 删除过时前缀，默认true
            flexbox: true                       // 为flexbox属性添加前缀，默认true
        }))
        .pipe(dest('./dist'))
    cb();
}

// gulpfile.js
const { src, dest } = require('gulp');
const useref = require('gulp-useref');
const userefTask = cb => {
    src('index.html')
        .pipe(useref())
        .pipe(dest('./dist'))
    cb();
}

const { src, dest } = require('gulp');
const rev = require('gulp-rev');

const revTask = cb => {
    src('./css/*.css')
        .pipe(rev())
        .pipe(dest('./dist/css'))
    cb();
}

const { src, dest } = require('gulp');
const rev = require('gulp-rev');
const revReplace = require('gulp-rev-replace');
const useref = require('gulp-useref');

const revReplaceTask = cb => {
    src('index.html')
        .pipe(useref())                         // 替换HTML中引用的css和js
        .pipe(rev())                            // 给css,js,html加上hash版本号
        .pipe(revReplace())                     // 把引用的css和js替换成有版本号的名字
        .pipe(dest('./dist'))
    cb();
}

// gulpfile.js
const { src, dest } = require('gulp');
const htmlreplace = require('gulp-html-replace');

const replaceTask = cb => {
    src('index.html')
        .pipe(htmlreplace({
            'css':'all.css'                     // css是index.html中定义的buildName
        }))
        .pipe(dest('./dist'))
    cb();
}

const { src, dest } = require('gulp');
const gulpif = require('gulp-if');
const uglify = require('gulp-uglify');
const concat = require('gulp-concat');
const condition = true; 

const ifTask = cb => {
    src('./js/*.js')
        .pipe(gulpif(condition, uglify(), concat('all.js')))  // condition为true时执行uglify(), else 执行concat('all.js')
        .pipe(dest('./dist/'));
    cb();
}

// package.json 

"devDependencies": {
    "gulp": "^3.9.1",
    "gulp-concat": "^2.6.1",
    "gulp-rename": "^1.2.2",
    "gulp-uglify": "^2.0.1"
}

// gulpfile.js
const { src, dest } = require('gulp');
const $ = require('gulp-load-plugins')();     // $ 是一个对象,加载了依赖里的插件

const minTask = cb => {
    src('./**/*.js')
        .pipe($.concat('all.js'))               // 使用插件就可以用$.PluginsName()
        .pipe($.uglify())
        .pipe($.rename('all.min.js'))
        .pipe(dest('./dist'))
    cb();
}

const { src, dest, watch } = require('gulp');
const sass = require('gulp-sass');

const sassTask = cb => {
    src('./sass/**/*.scss')
        .pipe(sass({
            outputStyle: 'compressed'           // 配置输出方式,默认为nested
        }))
        .pipe(dest('./dist/css'));
    cb();
}
watch('./sass/**/*.scss', sassTask);   // 实时监听sass文件变动,执行sass任务

const { src, dest } = require('gulp');
const babel = require('gulp-babel');

const jsTask = cb => {
    src('./js/index.js')
        .pipe(babel({
            presets: ['@babel/env'],
            sourceType: 'script'
        }))
        .pipe(dest('./dist'))
    cb();
}