保持对新技术的好奇心，深入研究当前工作使用的技术，同时进行一些输出，例如写博客，做开源，研究分享，写书等的，没有输出的学习就是耍流氓。 ——来自知乎

做项目时使用了browserify，但每次修改编译时间都很长，十几秒的样子？反正感觉等待编译的时间已经远远超过了修改代码的时间，忍无可忍之时，开始寻找解决方案。

于是很快就找到了watchify，简单理解，就是增量编译。

修改之前：

var source = require('vinyl-source-stream');
var browserify = require('browserify');
var streamify = require('gulp-streamify');

gulp.task('browserify', function () {
    var bundleStream = browserify('v1/js/app.js').bundle();

    return bundleStream
    .pipe(source('app.js'))
    .pipe(streamify(uglify()))
    .pipe(gulp.dest('./dev/js/'));
});

// after each change, execute browserify, make a long long progress...
gulp.task('release', ['browserify'], function () {
    return gulp.src('./dev/js/app.js')
    .pipe(gulp.dest('../static/js/'));
});

// watch everything
gulp.task('watch', function () {
    gulp.watch(['v1/less/**/*'], ['css2js']);
    gulp.watch(['v1/js/**/*'], ['release']);
});

...
gulp.task('default', ['release', 'watch']);

添加watchify：

var watchify = require('watchify'); 
var source = require('vinyl-source-stream');
var browserify = require('browserify');
var streamify = require('gulp-streamify');
var assign = require('lodash.assign');

var bundleStream = watchify(browserify(assign({}, watchify.args, {
    // required for watchify
    cache: {},
    // required for watchify
    packageCache: {},
    entries: ['v1/js/app.js']
}))); 

gulp.task('browserify', bundle);
// on any dep update, runs the bundler
bundleStream.on('update', bundle);
// output build logs to terminal
bundleStream.on('log', gutil.log);

function bundle() {  
  return bundleStream.bundle()
    // log errors if they happen
    .on('error', gutil.log.bind(gutil, 'Browserify Error'))
    .pipe(source('app.js'))
    .pipe(streamify(uglify()))
    .pipe(gulp.dest('./dev/js/'));
}

// browserify will not need
gulp.task('release', function () {
    return gulp.src('./dev/js/app.js')
    .pipe(gulp.dest('../static/js/'));
});

gulp.task('watch', function () {
    gulp.watch(['v1/less/**/*'], ['css2js']);
    // just watch one file produced by WATCHIFY
    gulp.watch(['./dev/js/app.js'], ['release']);
});

...
// only at the beginning browserify being executed
gulp.task('default', ['browserify', 'watch']);

延伸阅读及参考资料：

http://csspod.com/advanced-tips-for-using-gulp-js/

http://csspod.com/using-browserify-with-gulp/