gulp 学习笔记3 watch

gulp.watch 监视文件并且可以在文件发生改动时候做一些事情。

var gulp = require('gulp')
var uglify = require('gulp-uglify')
var cleancss = require('gulp-clean-css')
gulp.task('scripts',function () {
    gulp.src('app/js/*.js')
        .pipe(uglify())
        .pipe(gulp.dest('build/js'))
})

gulp.task('styles',function () {
  console.log('run minify css')
})

//watch task
//watch js
gulp.task('watch',function () {s
    gulp.watch('app/js/*.js',['scripts'])
})

gulp.task('default',['scripts','styles','watch'])