项目网址（牛人）：https://github.com/zce/zce-gulp-demo

项目网址：https://gitee.com/big-right-right/gulp-sample/tree/master/zce-gulp-demo

一. gulp构建项目

用gulp以及其丰富的插件，可以实现强大的项目构建功能，比如scss编译、js编译、文件压缩、开发中热更新、打包等功能。

二. 构建项目要点 

1. 编译样式文件(scss、less等)

2. 编译js文件(用babel转换es6+代码为es5)

3. 编译模板html文件(例中在html中使用了swig模板) 如不使用模板，也需进行html文件的拷贝

4. 压缩图片文件

5. 处理其它文件 如拷贝字体文件、public目录中的文件等

6. 实现开发热更新

7. 实现资源打包

三. 构建项目示例

gulpfile.js最终导出三个可执行的gulp任务(clean、develop、build)，可分别通过如下命令执行：

yarn gulp clean        用于清除开发过程中产生的文件

yarn gulp develop    用于启动热更新，进行开发

yarn gulp build         用于上线资源的打包

gulpfile.js文件 内容如下:

const { src, dest, parallel, series, watch } = require('gulp')

const del = require('del')
const browserSync = require('browser-sync')

// const sass = require('gulp-sass')
// const babel = require('gulp-babel')
// const swig = require('gulp-swig') // 一个模板引擎
// const imagemin = require('gulp-imagemin')
// gulp-load-plugins 可自动加载全部plugin
const loadPlugins = require('gulp-load-plugins')

const plugins = loadPlugins()
const bs = browserSync.create()

const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

const clean = () => {
  return del(['dist', 'temp'])
}

const style = () => {
  return src('src/assets/styles/*.scss', { base: 'src' })
    .pipe(plugins.sass({ outputStyle: 'expanded' }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}

const script = () => {
  return src('src/assets/scripts/*.js', { base: 'src' })
    .pipe(plugins.babel({ presets: ['@babel/preset-env'] }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}

const page = () => {
  return src('src/*.html', { base: 'src' })
    .pipe(plugins.swig({ data, defaults: { cache: false } })) // 防止模板缓存导致页面不能及时更新
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}

const image = () => {
  return src('src/assets/images/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
  return src('src/assets/fonts/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () => {
  return src('public/**', { base: 'public' })
    .pipe(dest('dist'))
}

const serve = () => {
  watch('src/assets/styles/*.scss', style)
  watch('src/assets/scripts/*.js', script)
  watch('src/*.html', page)
  // watch('src/assets/images/**', image)
  // watch('src/assets/fonts/**', font)
  // watch('public/**', extra)
  watch([
    'src/assets/images/**',
    'src/assets/fonts/**',
    'public/**'
  ], bs.reload)

  bs.init({
    notify: false,
    port: 2080,
    // open: false,
    // files: 'dist/**',
    server: {
      baseDir: ['temp', 'src', 'public'],
      routes: {
        '/node_modules': 'node_modules'
      }
    }
  })
}

const useref = () => {
  return src('temp/*.html', { base: 'temp' })
    .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
    // html js css
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
    })))
    .pipe(dest('dist'))
}

const compile = parallel(style, script, page)

// 上线之前执行的任务
const build =  series(
  clean,
  parallel(
    series(compile, useref),
    image,
    font,
    extra
  )
)

const develop = series(compile, serve)

module.exports = {
  clean,
  build,
  develop
}

package.json文件 内容如下：

{
  "name": "zce-gulp-demo",
  "version": "0.1.0",
  "main": "index.js",
  "repository": "https://github.com/zce/zce-gulp-demo.git",
  "author": "zce <w@zce.me> (https://zce.me)",
  "license": "MIT",
  "scripts": {
    "clean": "gulp clean",
    "build": "gulp build",
    "develop": "gulp develop"
  },
  "dependencies": {
    "bootstrap": "^4.3.1",
    "jquery": "^3.4.1",
    "popper.js": "^1.15.0"
  },
  "devDependencies": {
    "@babel/core": "^7.5.5",
    "@babel/preset-env": "^7.5.5",
    "browser-sync": "^2.26.7",
    "del": "^5.1.0",
    "gulp": "^4.0.2",
    "gulp-babel": "^8.0.0",
    "gulp-clean-css": "^4.2.0",
    "gulp-htmlmin": "^5.0.1",
    "gulp-if": "^3.0.0",
    "gulp-imagemin": "^6.1.0",
    "gulp-load-plugins": "^2.0.1",
    "gulp-sass": "^4.0.2",
    "gulp-swig": "^0.9.1",
    "gulp-uglify": "^3.0.2",
    "gulp-useref": "^3.1.6"
  }
}

本文 完。