PROSAGA码农传奇-gulp-如何使用Gulp 4设置browserSync重装html，js？

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  <P>
    我也有这个错误。我做了单独的重装功能，并做了gulp默认任务。检查我的gulp文件代码以便更好地理解。
  </p>
   <pre>
    <code>
      //Importing dependencies
var gulp = require ('gulp'),
    autoprefixer = require('gulp-autoprefixer'),
    browserSync = require('browser-sync').create(),
    sass = require('gulp-sass'),
    cleanCSS = require('gulp-clean-css'),
    sourcemaps = require('gulp-sourcemaps'),
    concat = require('gulp-concat'),
    imagemin = require('gulp-imagemin'),
    changed = require('gulp-changed'),
    uglify = require('gulp-uglify'),
    lineec = require('gulp-line-ending-corrector');

// BrowserSync
function serve(done) {
  browserSync.init({
    server: {
      baseDir: "./src/"
    },
    port: 3000
  });
  done();
}

// BrowserSync Reload
function reload(done) {
  browserSync.reload();
  done();
}

//Declaring Paths
var paths = {
    styles:{
      src:'./src/scss/*.scss',
      dest: './src/css/'
    },
    custom_js:{
      src:'./src/scripts/*.js',
      dest:'./src/js'
    }
}

//Compiling & Moving Custom SASS
function custom_sass() {
  return gulp
    .src(paths.styles.src)
    .pipe(sourcemaps.init())
      .pipe(sass())
    .pipe(autoprefixer({
            browsers: ['last 2 versions'],
            cascade: false}))
    .pipe(cleanCSS())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(paths.styles.dest));
}

//Custom Scripts
function custom_js(){
  return gulp
    .src(paths.custom_js.src)
    .pipe(sourcemaps.init())
    .pipe(uglify())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(paths.custom_js.dest));
}

//Watching File
function watch() {
  gulp.watch(paths.styles.src, gulp.series(custom_sass,reload));
  gulp.watch(paths.custom_js.src, gulp.series(custom_js,reload));
  gulp.watch('./src/*.html', reload);
}

//Compiling & Moving stylesheets & Scripts
var files = gulp.parallel(custom_sass, custom_js);

//Building task
var build = gulp.series( files, gulp.parallel(serve, watch));
gulp.task(build);
gulp.task('default', build);

</code>
  </pre>
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