在internet上，B/S结构的程序，胖客户端的概念已经提出来很多年了。应该很多人都在向这个方面努力，好处就不用说了，当然是为了减少服务器负担，同时也能减少些网络负担。像大部份的门户，访问得人实在太多了，单台服务器跟本没有办法处理这个工作量，所以集群技术被利用了，但又有多少公司能单单为一个网页提供一整套集群服务呢？所以，人多就是麻烦事喽~~
而胖客户的路线也不见得完全正确，典型的例子http://www.chouti.com一个网址收藏网站，基本上完全尊照了胖客户的思路开发了它的网站，用了全套的ajax程序，同时问题也产生了，总是角本错误不断，更完这那儿又出现问题。我相信他们的开发团队也是一个很强的团队，但还是有问题啊。总结来说，同时让客户端载入所有要用和暂时不用的函数，对javascirpt语言来说，并不是一件这么容易的事啊。
所以我有了想动态载入javascirpt函数的想法.利用ajax技术和类技术我想完全可以实现。基本的思种非常明确，当客户端要使用某一个函数的时候，很check内存，此函数之前是否已经使用过,如果使用过，直接加载使用，如果没有使用过，就向服务器发出请求，把函数体入到本地，然后使用之。
思路虽然有了，但是我还没有完成示例代码~~嘿嘿
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