请问：淘宝首页的CSS引入方式是如何？


http://a.tbcdn.cn/p/fp/2011a/??html5-reset-min.css,global-min.css,header/header-min.css,product-list/product-list-min.css,attraction/attraction-min.css,expressway/expressway-min.css,category/category-min.css,category/sub-promotion-min.css,guide/guide-min.css,hotsale/hotsale-min.css,bottom-gg/bottom-gg-min.css,subfooter/subfooter-min.css,local-life/local-life-min.css,footer/footer-min.css?t=20110922.css貌似有好几个CSS文件，为什么一下子就能引入呢？是后台做了处理么？