前端工程打开速度优化的循序渐进总结: http://www.cnblogs.com/zhengyun_ustc/archive/2013/05/09/frontendoptimize.html
js和css的顺序关系: http://hikejun.com/blog/2012/02/02/js%E5%92%8Ccss%E7%9A%84%E9%A1%BA%E5%BA%8F%E5%85%B3%E7%B3%BB/
http://www.douban.com/note/153864670/
