使用gulp.watch（...）来跟踪所有的更改，不仅仅是html。gulp中的任何文件都可以使用这种方法来跟踪。

const gulp = require('gulp');
const include_file = require('gulp-file-include');

gulp.task('include', () => {
  return gulp.src('./res/*.html')
    .pipe(include({
      prefix: "@@",
      basepath: "@file"
    }))
    .pipe(gulp.dest('./public'));
});

gulp.task('watch', () => {
  gulp.watch('./res/*.html', gulp.series('include'));
})

还有我的变体：

const { src, dest, watch } = require('gulp'),
 include_file = require('gulp-file-include');

function include() {
  return src('./res/*.html')
    .pipe(file_include({
      prefix: '@',
      basepath: '@file'
    }))
    .pipe(dest('./public/'));
}

function watching() {
  watch('./res/*.html', include);
}

exports.watch = watching;

然后：

gulp watch