text: const $gulp = require('gulp');
  
  // =================
  // tools
  // =================
  // 用于解决 windows 下目录删除未及时完成的问题
  $gulp.task('tool-wait', done => setTimeout(done, 1000));
  
  $gulp.task(
  	'tool-copy2demo',
  	() => $gulp.src(['./dist/*']).pipe($gulp.dest('./demo/dist'))
  );
  