注意到，具体刷新的时候，我的配置是这样的

gulp.watch("app/*.html").on('change', browserSync.reload);

而之前的配置无效？"/**/*.html" 但是可以监听到，但是reload不能够

其二：
reload("index.html"） 重载某一个是可以的

// gulpfile.babel.js
// Skip to content
// Gulp 4 + Browsersync
//  gulpfile.babel.js
import gulp from 'gulp';
import babel from 'gulp-babel';
import browserSync from 'browser-sync';
import del from 'del';

const server = browserSync.create();

const paths = {
  scripts: {
    src: 'src/scripts/**/*.js',
    dest: 'dist/scripts/'
  },
  styles: {
    src: 'src/styles/**/*.css',
    dest: 'dist/styles/'
  },
  html: {
    src: 'src/*.html',
    dest: 'dist/'
  },
  images: {
    src: 'src/images/**/*.{jpg, jpeg, png, svg}',
    dest: 'build/images/'
  }
};


/**********    Build tasks    **********/

// Delete dist folder
export const clean = () => del(['dist']);

// Process and uglify js, copy to dist folder
export function scripts() {
  return gulp.src(paths.scripts.src)
    .pipe(gulp.dest(paths.scripts.dest));
}

// Process and minify css, copy to dist folder
export function styles() {
  return gulp.src(paths.styles.src)
    .pipe(gulp.dest(paths.styles.dest))
}

// Copy html to dist folder
export function html() {
  return gulp.src(paths.html.src)
    .pipe(gulp.dest(paths.html.dest));
}


/**********    Image Handling    **********/

// Minify images and copy to build folder
export function images() {
  return gulp.src(paths.images.src, { since: gulp.lastRun(images)})
    .pipe(gulp.dest(paths.images.dest));
}


/**********    Development    **********/

// Start serving src folder
export function serve(done) {
  server.init({
    server: {
      baseDir: './src'
    }
  });
  done();
}

// Reload the server
export function reload(done) {
  server.reload('index.html');
  done();
}

// Watch files for changes and reload server
export function watch() {
  gulp.watch(paths.scripts.src, gulp.series(scripts, reload));
  gulp.watch(paths.styles.src, gulp.series(styles, reload));
  gulp.watch(paths.html.src, gulp.series(html, reload));
}

// Build dist folder, start server, and watch files
const build = gulp.series(clean, gulp.parallel(scripts, styles, html, images), serve, watch);

// Set build as default task
export default build;

// .babelrc
{
  "presets": [
    "@babel/preset-env"
  ]
}