自用gulp打包脚本，压缩html，压缩js，压缩css，压缩图片，功能齐全

const gulp = require('gulp');
const fs = require('fs');
const htmlmin = require('gulp-htmlmin');
const uglify = require('gulp-uglify');
const uglifyEs = require('uglify-es');
const minifyCSS = require('gulp-minify-css');
const imagemin = require('gulp-imagemin');
const babel = require('gulp-babel');
const replace = require('gulp-replace');

const version = new Date().getTime();

/**
 * 清空
 */
function clear(dist = 'dist') {
  if (fs.existsSync(dist)) {
    console.log("清空");
    fs.rmSync(dist, { recursive: true });
  }
}

function compressHtml(src, base = 'src', dist = 'dist') {
  gulp.src(src, { base: base, allowEmpty: true })
    .pipe(replace('199210103019', version + ''))
    .pipe(replace(/(<link\s+.+\.css\?[^\"]+)/gi, '$1&zqd=' + version))
    .pipe(replace(/(<link\s+.+\.css)\"/gi, '$1?zqd=' + version + '"'))
    .pipe(replace(/(<script\s+.+\.js\?[^\"]+)/gi, '$1&zqd=' + version))
    .pipe(replace(/(<script\s+.+\.js)\"/gi, '$1?zqd=' + version + '"'))
    .pipe(htmlmin({
      removeComments: true,
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: file => uglifyEs.minify(file, { mangle: true }).code
    }))
    .pipe(gulp.dest(dist));
}

function compressJs(src, base = 'src', dist = 'dist') {
  gulp.src(src, { base: base, allowEmpty: true })
    .pipe(replace('199210103019', version + ''))
    .pipe(babel())
    .pipe(uglify({ mangle: { toplevel: true }, output: { ascii_only: true } }))
    .pipe(gulp.dest(dist));
}

function compressCss(src, base = 'src', dist = 'dist') {
  gulp.src(src, { base: base, allowEmpty: true })
    .pipe(minifyCSS())
    .pipe(gulp.dest(dist));
}

function compressImage(src, base = 'src', dist = 'dist') {
  gulp.src(src, { base: base })
    .pipe(imagemin({
      optimizationLevel: 5,
      progressive: true,
      webp: { quality: 75 },
      pngquant: { quality: '60-80' },
      svgoPlugins: [{ removeViewBox: false }]
    }))
    .pipe(gulp.dest(dist));
}

/**
 * 复制源目录到发布目录
 * @param {string} src 源目录
 * @param {string} dist 发布目录
 */
function cp2Dist(src, dist = 'dist') {
  if (typeof (src) === 'string') {
    fs.cpSync(src, dist + '/' + src, { recursive: true });
  }
  else {
    for (var s of src) {
      fs.cpSync(s, dist + '/' + s, { recursive: true });
    }
  }
}

/**
 * 打包发布
 */
async function release(cb) {
  await clear();

  await cp2Dist(['favicon.ico', 'layuiadmin', 'views']);

  compressHtml([
    '*.html',
    'views/*.html',
    'views/**/*.html'], '.');

  compressJs(['layuiadmin/*.js',
    'layuiadmin/modules/*.js',
    'layuiadmin/lib/*.js',
    '!layuiadmin/layui/*.js',
    'layuiadmin/lib/**/echartsTheme.js'], '.');

  compressCss([
    'layuiadmin/style/*.css',
    'layuiadmin/style/system/*.css',
    'layuiadmin/style/system/ztree/awesomeStyle/layuiAwesome.css'], '.');

  compressImage([
    'layuiadmin/images/*',
    'layuiadmin/style/res/*'], '.');

  console.log("完成打包");
  return cb();
};

//清空
gulp.task('clear', () => clear());

//打包发布
gulp.task('release', release);

gulp.task('default', release);