发布于 2015-12-13 21:26:04 | 204 次阅读 | 评论: 0 | 来源: PHPERZ
GulpJS 流构建系统
从头编写HTML\CSS\Javascript是上个世纪的事情了，如今的JavaScript都是通过CoffeeScript这样的支持句法缩写的编辑器写成的。如果你希望写完JavaScript能够一个工具完成代码清理优化工作，Gulp 就是你的不二之选，GulpJS类似Ant或Maven之于Java。
gulp是在你的开发过程中用来帮你自动化一些麻烦耗时的工作的工具集。比如在web开发过程中，它能帮你完成css预处理，js文件整合，压缩，实时重加载等等。并且它还和目前市场上主流的IDE整合，无论是在PHP,.NET,Node.js,Java等等开发者都很喜欢用它。拥有超过1700中插件，gulp能够让你从繁琐的构建系统中解脱出来，真正的开始干活。
安装Node.js
创建一个项目，比如说gulptest
在控制台项目路径下，npm init，跟着步骤创建package.json文件
npm install --global gulp，使gulp命令可以在命令行中使用。
npm install --save-dev gulp，在项目上安装gulp模块，同时将 gulp添加到package.json的dev-dependencies依赖中。
比如我们需要压缩css文件，先安装需要的模块npm install --save-dev gulp-minify-css
在项目路径下创建gulpfile.js
var gulp = require('gulp');
var minifyCss = require('gulp-minify-css');
gulp.task('minify-css', function() {
return gulp.src('styles/*.css')
.pipe(minifyCss({compatibility: 'ie8'}))
.pipe(gulp.dest('dist'));
});
运行gulp minify-css命令
Emits files matching provided glob or an array of globs. Returns a stream of Vinyl files that can be piped to plugins.
gulp.src('client/templates/*.jade')
.pipe(jade())
.pipe(minify())
.pipe(gulp.dest('build/minified_templates'));
根据路径找到文件然后把它放在流里面pipe到gulp插件
gulp.src('client/js/**/*.js') // Matches 'client/js/somedir/somefile.js' and resolves `base` to `client/js/`
.pipe(minify())
.pipe(gulp.dest('build')); // Writes 'build/somedir/somefile.js'
gulp.src('client/js/**/*.js', { base: 'client' })
.pipe(minify())
.pipe(gulp.dest('build')); // Writes 'build/js/somedir/somefile.js'
Can be piped to and it will write files. Re-emits all data passed to it so you can pipe to multiple folders. Folders that don't exist will be created.
gulp.src('./client/templates/*.jade')
.pipe(jade())
.pipe(gulp.dest('./build/templates'))
.pipe(minify())
.pipe(gulp.dest('./build/minified_templates'));
Define a task using Orchestrator.
gulp.task('somename', function() {
// Do stuff
});
An array of tasks to be executed and completed before your task will run.
gulp.task('mytask', ['array', 'of', 'task', 'names'], function() {
// Do stuff
});
You can also omit the function if you only want to run the dependency tasks:
gulp.task('build', ['array', 'of', 'task', 'names']);
Accept a callback
// run a command in a shell
var exec = require('child_process').exec;
gulp.task('jekyll', function(cb) {
// build Jekyll
exec('jekyll build', function(err) {
if (err) return cb(err); // return error
cb(); // finished task
});
});
Return a stream
gulp.task('somename', function() {
var stream = gulp.src('client/**/*.js')
.pipe(minify())
.pipe(gulp.dest('build'));
return stream;
});
Return a promise
var Q = require('q');
gulp.task('somename', function() {
var deferred = Q.defer();
// do async stuff
setTimeout(function() {
deferred.resolve();
}, 1);
return deferred.promise;
});
默认情况下task中的任务是同步进行的，所以，如果需要在保证某一项任务在其他之前可以按照如下操作：
var gulp = require('gulp');
// takes in a callback so the engine knows when it'll be done
gulp.task('one', function(cb) {
// do stuff -- async or otherwise
cb(err); // if err is not null and not undefined, the run will stop, and note that it failed
});
// identifies a dependent task must be complete before this one begins
gulp.task('two', ['one'], function() {
// task 'one' is done now
});
gulp.task('default', ['one', 'two']);
Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
Names of task(s) to run when a file changes, added with gulp.task()
var watcher = gulp.watch('js/**/*.js', ['uglify','reload']);
watcher.on('change', function(event) {
console.log('File ' + event.path + ' was ' + event.type + ', running tasks...');
});
编译Sass gulp-ruby-sass
自动添加前缀 gulp-autoprefixer
压缩CSS gulp-minify-css
JSHint gulp-jshint
Concatenation gulp-concat
Uglify gulp-uglify
图片压缩 gulp-imagemin
实时重加载 gulp-livereload
图片缓存从而只压缩改变的图片 gulp-cache
Notify of changes gulp-notify
清除文件干净地构建 del