发布于 2015-08-27 16:40:05 | 291 次阅读 | 评论: 0 | 来源: 网络整理
UglifyJS is a JavaScript parser/compressor/beautifier toolkit. It can be used to combine and minify JavaScript assets so that they require less HTTP requests and make your site load faster. UglifyCSS is a CSS compressor/beautifier that is very similar to UglifyJS.
In this cookbook, the installation, configuration and usage of UglifyJS is shown in detail. UglifyCSS works pretty much the same way and is only talked about briefly.
UglifyJS is available as a Node.js module. First, you need to install Node.js and then, decide the installation method: global or local.
The global installation method makes all your projects use the very same UglifyJS version, which simplifies its maintenance. Open your command console and execute the following command (you may need to run it as a root user):
$ npm install -g uglify-js
Now you can execute the global uglifyjs command anywhere on your system:
$ uglifyjs --help
It’s also possible to install UglifyJS inside your project only, which is useful
when your project requires an specific UglifyJS version. To do this, install it
without the -g option and specify the path where to put the module:
$ cd /path/to/your/symfony/project
$ npm install uglify-js --prefix app/Resources
It is recommended that you install UglifyJS in your app/Resources folder and
add the node_modules folder to version control. Alternatively, you can create
an npm package.json file and specify your dependencies there.
Now you can execute the uglifyjs command that lives in the node_modules
directory:
$ "./app/Resources/node_modules/.bin/uglifyjs" --help
uglifyjs2 Filter¶Now we need to configure Symfony to use the uglifyjs2 filter when processing
your JavaScripts:
# app/config/config.yml
assetic:
filters:
uglifyjs2:
# the path to the uglifyjs executable
bin: /usr/local/bin/uglifyjs
<!-- app/config/config.xml -->
<assetic:config>
<!-- bin: the path to the uglifyjs executable -->
<assetic:filter
name="uglifyjs2"
bin="/usr/local/bin/uglifyjs" />
</assetic:config>
// app/config/config.php
$container->loadFromExtension('assetic', array(
'filters' => array(
'uglifyjs2' => array(
// the path to the uglifyjs executable
'bin' => '/usr/local/bin/uglifyjs',
),
),
));
注解
The path where UglifyJS is installed may vary depending on your system.
To find out where npm stores the bin folder, execute the following command:
$ npm bin -g
It should output a folder on your system, inside which you should find the UglifyJS executable.
If you installed UglifyJS locally, you can find the bin folder inside
the node_modules folder. It’s called .bin in this case.
You now have access to the uglifyjs2 filter in your application.
node Binary¶Assetic tries to find the node binary automatically. If it cannot be found, you
can configure its location using the node key:
# app/config/config.yml
assetic:
# the path to the node executable
node: /usr/bin/nodejs
filters:
uglifyjs2:
# the path to the uglifyjs executable
bin: /usr/local/bin/uglifyjs
<!-- app/config/config.xml -->
<assetic:config
node="/usr/bin/nodejs" >
<assetic:filter
name="uglifyjs2"
bin="/usr/local/bin/uglifyjs" />
</assetic:config>
// app/config/config.php
$container->loadFromExtension('assetic', array(
'node' => '/usr/bin/nodejs',
'uglifyjs2' => array(
// the path to the uglifyjs executable
'bin' => '/usr/local/bin/uglifyjs',
),
));
In order to apply UglifyJS on your assets, add the filter option in the
asset tags of your templates to tell Assetic to use the uglifyjs2 filter:
{% javascripts '@AppBundle/Resources/public/js/*' filter='uglifyjs2' %}
<script src="{{ asset_url }}"></script>
{% endjavascripts %}
<?php foreach ($view['assetic']->javascripts(
array('@AppBundle/Resources/public/js/*'),
array('uglifyj2s')
) as $url): ?>
<script src="<?php echo $view->escape($url) ?>"></script>
<?php endforeach ?>
注解
The above example assumes that you have a bundle called AppBundle and your
JavaScript files are in the Resources/public/js directory under your
bundle. However you can include your JavaScript files no matter where they are.
With the addition of the uglifyjs2 filter to the asset tags above, you
should now see minified JavaScripts coming over the wire much faster.
Minified JavaScripts are very difficult to read, let alone debug. Because of
this, Assetic lets you disable a certain filter when your application is in
debug (e.g. app_dev.php) mode. You can do this by prefixing the filter name
in your template with a question mark: ?. This tells Assetic to only
apply this filter when debug mode is off (e.g. app.php):
{% javascripts '@AppBundle/Resources/public/js/*' filter='?uglifyjs2' %}
<script src="{{ asset_url }}"></script>
{% endjavascripts %}
<?php foreach ($view['assetic']->javascripts(
array('@AppBundle/Resources/public/js/*'),
array('?uglifyjs2')
) as $url): ?>
<script src="<?php echo $view->escape($url) ?>"></script>
<?php endforeach ?>
To try this out, switch to your prod environment (app.php). But before
you do, don’t forget to clear your cache
and dump your assetic assets.
小技巧
Instead of adding the filters to the asset tags, you can also configure which filters to apply for each file in your application configuration file. See Filtering Based on a File Extension for more details.
The usage of UglifyCSS works the same way as UglifyJS. First, make sure the node package is installed:
# global installation
$ npm install -g uglifycss
# local installation
$ cd /path/to/your/symfony/project
$ npm install uglifycss --prefix app/Resources
Next, add the configuration for this filter:
# app/config/config.yml
assetic:
filters:
uglifycss:
bin: /usr/local/bin/uglifycss
<!-- app/config/config.xml -->
<assetic:config>
<assetic:filter
name="uglifycss"
bin="/usr/local/bin/uglifycss" />
</assetic:config>
// app/config/config.php
$container->loadFromExtension('assetic', array(
'filters' => array(
'uglifycss' => array(
'bin' => '/usr/local/bin/uglifycss',
),
),
));
To use the filter for your CSS files, add the filter to the Assetic stylesheets
helper:
{% stylesheets 'bundles/App/css/*' filter='uglifycss' filter='cssrewrite' %}
<link rel="stylesheet" href="{{ asset_url }}" />
{% endstylesheets %}
<?php foreach ($view['assetic']->stylesheets(
array('bundles/App/css/*'),
array('uglifycss'),
array('cssrewrite')
) as $url): ?>
<link rel="stylesheet" href="<?php echo $view->escape($url) ?>" />
<?php endforeach ?>
Just like with the uglifyjs2 filter, if you prefix the filter name with
? (i.e. ?uglifycss), the minification will only happen when you’re
not in debug mode.