使用 Symfony Asset 组件管理你的 CSS Javascript 和图片文件
之所以想介绍 Symfony Asset 组件，是因为我估计这个组件是 Symfony 组件包里可能最容易被轻视的组件之一了。我之前就从来没有正眼看过相关的文档，也从来没用过相关功能，直到最近公司网站要做 CDN 加速的时候，才想起来有这么一个东西。
可能很多学习 Symfony 的同学或多或少都在 Symfony 官方最佳实践教程里看到过 asset这个 twig 函数，但文档并没有解释 asset是做什么的，能带来什么样的好处。我最近仔细阅读了 Asset 组件的文档，并做了相关实践，把一些有用的信息分享一下。
Asset 是什么东东？
其实就是 css / javascript / 图片 这类静态文件的统称啦。
Asset 管理维护会遇到的常见问题
过去静态文件的路径都是写死在模板文件里的，比如官网提供的例子：
<linkrel="stylesheet" type="text/css" href="/css/main.css"> <!-- ... --> <ahref="/"><img src="/static/imghw/default1.png" data-src="/images/logo.png" class="lazy" alt="使用 Symfony Asset 组件管理你的 CSS Javascript 和图片文件" ></a>
除非真的是一个相当相当简单的项目你可以这么写，你最好不要把这些路径写死，因为你会给你自己挖以下几个坑儿：
- 你要不断得在每一个引用静态文件的地方写全路径。
- 版本管理麻烦。你可能想要缓存你的静态文件，而缓存静态文件需要通过在 URL 地址后面添加版本号（一般来说类似于 /main.css?v=1的方式）来控制缓存是否要更新，但如果你的路径都是在各个文件里写死的……那你就一个一个慢慢改吧，还容易漏。
- 项目刚开始静态文件路径写死一时爽，万一静态文件目录的路径变了你就傻叉了，又一个一个慢慢改吧。
- 有一种技术叫做多 CDN，用来减轻单 CDN 的压力。假如文件 main.css做了两个 CDN http://cdn1.com/main.css和 http://cdn2.com/main.css，如果路径是写死的，你如何做到让页面随机返回这两个 CDN 地址中的其中一个？
那 Symfony Asset 组件能干啥？
正好对应于上面的几个问题：
- 有了它，你不用再把路径写全了，而是可以把公用的目录部分省略掉
- 有了它，指定静态文件版本方便了，就一个配置的事儿！
- 有了它，移动静态文件的位置方便了，换目录换域名换 CDN，随便换！
- 有了它，实现多 CDN 不是梦！
今天我先写到这儿吧。如果大家是从非我个人网站（http://chrisyue.com）看到的转载，请点原文看看后续有没有完成。
Symfony Asset 组件这么棒，怎么用呢？
我用的是 Symfony 框架，那在框架里该如何使用 Symfony Asset 组件呢？
弱弱的多问一句：Symfony Assetic 组件又是什么鬼，跟 Asset 组件有什么关系吗？
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