ajax简单与ajax+php实例应用(1/4)
[ajax介绍]
ajax是使用客户端脚本与web服务器交换数据的web应用开发方法。web页面不用打断交互流程进行重新加裁，就可以动态地更新。使用ajax，用户可以创建接近本地桌面应用的直接、高可用、更丰富、更动态的web用户界面。
异步网页特效和xml（ajax）不是什么新技术，而是使用几种现有技术——包括级联样式表（css教程）、网页特效、xhtml、xml和可扩展样式语言转换（xslt），开发外观及操作类似桌面软件的web应用软件。
[ajax执行原理]
一个ajax交互从一个称为xmlhttprequest的javascript对象开始。如同名字所暗示的，它允许一个客户端脚本来执行http请求，并且将会解析一个xml格式的服务器响应。ajax处理过程中的第一步是创建一个xmlhttprequest实例。使用http方法（get或post）来处理请求，并将目标url设置到xmlhttprequest对象上。
当你发送http请求，你不希望浏览器挂起并等待服务器的响应，取而代之的是，你希望通过页面继续响应用户的界面交互，并在服务器响应真正到达后处理它们。要完成它，你可以向xmlhttprequest注册一个回调函数，并异步地派发xmlhttprequest请求。控制权马上就被返回到浏览器，当服务器响应到达时，回调函数将会被调用。
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