这是我的代码
var gulp = require('gulp');
var browserify = require('gulp-browserify');
var rename = require('gulp-rename');
var uglify = require('gulp-uglify');
gulp.task('js', function () {
    gulp.src('js/main.js')
        .pipe(browserify())
        .pipe(rename('js/bundle.js'))
        .pipe(uglify())
        .pipe(gulp.dest('./'));
})
gulp.task('watch', function () {
    gulp.watch('js/*.js', ['js']);
})